Whether custom servers ever have their potential fully realized or not I dunno
but I think they are the future of the game and more necessary than anything else.
The combination or propping up alliance servers with rewards that aren't consistent with the foundation of the game or any balancing around it and having full power from the dock as a fresh spawn has created a food chain that squeezes the life out of the piratical food chain rather than maintains it.
Custom servers will be necessary imo to keep longevity within the game. Keep the content and thrill flowing. Pve/pvp shared environment has always and will always be an excellent foundation imo but it can be tinkered with too much and imo we are out of the zone of sustainability to keep longevity thriving on its own.
Doesn't mean they will be implemented in a way that is perfect for support of the foundation but it's what makes the most sense imo.
In my view it's not sustainable to have it very easy to opt out of the risk reward system for max reward to an extreme degree on both ends
That is punishing the people that play the game (in regards to risk/reward) as intended with a difficulty and risk that do not match the reward. Organic experiences within the risk/reward system should have always been the priority imo. I think we sacrificed balance and health of the game long term for content and QoL aka convenience at the time. To some degree it's understandable, just went too far for too long.
These dead servers aren't because of content or because of 5 ships a server or any of the other common narratives imo. It's because high risk for eh reward when the opponent has made very little server investment while others have 600 million from sitting on alliance servers all day doesn't make sense and people are figuring that out more and more as they get immobilized and camped from a crew with no loot that came straight from the dock when they try to play the game organically. A style of piracy that should be allowed but not enabled with powerful resources.
Gonna need custom servers coming out of the gate appealing as heck with customization imo to get some activity popping which will at least help for a while.