Firstly, I think that there is a massive lack of understanding as to why the commendation rebalancing was so destructive for some who play the game. This is largely because most players don't necessarily see the value in commendations the same way that people who have reached Athena 10 do. It's true that it is a smaller (but ever growing) community of players, but they are still people who very much love the game and should be treated with the same respect and decency as anyone else.
It's easy for those who are still working towards Pirate Legend or Athena 10 to simply disregard, dismiss, and even belittle those affected by the rebalance because they don't understand how important those commendations were to them. I really want to try to layout the issues with the recent changes and detail why I think that they were very hurtful to many dedicated players.
Why Commendations Were Important
Prior to reaching Athena 10, I couldn't have cared less about the commendations. They were boring and insignificant compared to the thrill of reaching Pirate Legend and Athena 10. However, once I had reached these milestones, chipping away at the commendations gave me a reason to keep playing.
There was freedom to play the game however I wanted. It didn't matter if it was open/closed crews, skull forts, MA, GH, or OoS. It was even great playing with new players since their voyages had a lot of foul skulls and castaway's (which are quite rare at higher levels). They all counted towards the commendations. New content updates would come and go, but progress on the commendations lived on. I felt like I could keep playing for a year and still have commendations to work on. The game felt immortal.
This feeling of making progress on long-term made playing SoT seem quite meaningful. It was the sole reason that I continued to play for the past 5 months. I have added over a hundred people to my friends list and play with around 20 of them regularly. We all had a similar journey with the game, reaching PL and A10, and then moving on to the commendations.
The Rebalance Betrayal
The recent rebalancing has been devastating for us. It has taken that which was most important to us and bastardized it in such a way that it will continue to torment us for as long as we play this game. I've been hearing players on random crews say things like: "Ha! I just unlocked the [some title that use to take 4, 5, or even 10 times more effort to achieve] title and I didn't have to do anything for it!" Which almost makes me feel sick to my stomach. These types of things will continue to happen and are a constant reminder of how Rare betrayed us.
Betrayal is the only word that I can find that fits the way that I and many others feel. It is only when you believe deeply in something that you become vulnerable to those beliefs being invalidated. It is akin to be cheated and humiliated by someone you placed great faith in. Many of us invested countless hours into working on the goals laid out by Rare with the absolute belief that reaching the finish line would be a meaningful accomplishment and give a rare and prestigious title as a reward. However, after 5 months of Rare letting people pour time and effort into these goals, it has stabbed them all in the back and made them look like fools.
Why?
Why would Rare do something that would deeply hurt so many people? I suppose it's possible that they have very little understanding of how people play the game past Pirate Legend and Athena 10. And so, didn't understand how important these commendations were to the more advanced players. The alternative is, of course, that they just thought internally that progress isn't always pretty and that sometimes it has to come at the expense of others. So it's better to do it now than later. I do quite hope that the former is the case, though. Since intentionally humiliating and tormenting people like that is evil.
The reality of this is that it was completely unnecessary. The commendations mean almost nothing to new players. They have grand goals like working towards Pirate Legend and, later on, Athena 10. Why on earth would they need an incentive to grind out commendations? I thought the commendations were dumb before hitting Pirate Legend and Athena 10 and would have been fine with them being lowered then because I didn't care about them. It was only after reaching Athena 10 that they began to mean something. For these reasons, bastardizing commendations to make them appealing to new players was absolutely the wrong thing to do.
Aftermath
All that Rare did with this move was betray and humiliate the people who have played this game since the beginning. New players have so much else going on that they will never see much value in long-term goals that come from commendation progression. The stolen goals and aspirations of the old have little value through the eyes of the young.
It is truly a travesty that Rare got this so wrong. Did they ever run this by anyone who was Athena 10 to get their thoughts on it? The progression path was perfect: Pirate Legend, Athena 10, commendations. Players at all stages of this path had meaningful goals to work towards, but now, the commendations are mostly finished by the time you get to Athena 10. The game seems to have a life that is more finite now. With a green flash, its previous immortality has turned to dust and been carried away by the wind.
Some hold onto hope that Rare will somehow make this right, but I know better. Just as you can't put toothpaste back in the tube, there is no way to repair the damage done by the rebalance. It has left many of us resentful and cynical. All that Rare has said about this is that next week they're coming out with new goals for Pirate Legends. Well destroying the progress that many of us had over the past five months so that all PLs (new and old) can start at zero again is not going to make us feel any better.

