@sweetsandman a lot of the recent reaper ones are pretty bad, including Reaper Rivals because no one does that content anymore. Stealing commodity crates is another one for the same reason. I imagine that the 3 or 4 tomes collecting ones aren't great, and anything that requires another crew to help you do something specific that isn't going to happen unless you cheese it (eg. Horn of Winds and knocking players off a tightrope). Even the Weekender continued to do stuff like that for the challenges.
That is a common Rare problem though; pushing out features and then letting them die so they become obnoxiously frustrating if you try to do them beyond the release window. They need to refresh content and be willing to adjust bad commendations but they don't seem to be open to doing so.
If the Weekender and recent ignored feedback regarding commendations is anything to go on, they're just going to continue on the same track which makes tying more cosmetics to them a lateral move at best if accessibility of cosmetics is the issue.