OP you listed a lot of good points in your post. I think the reason you are moving on though is because of a lack of content. If I read it right.
Ive personally barely been playing because I dont want to reach end game. Ive realized how short the game actually is and it worries me. I was hoping to play STO for a good long time. But Im not sure if its really possible to PLAY STO for a long time.
The game is short. People are reaching Admiral easily long before even one month has gone by. Then there is nothing really to do. And its made worse by the fact there is such a limited number of character slots for alts.
Im beginning to think that this games downfall may very well be the severe lack of content. What content that is there is great in my opinion (some things could use some polish). But is there enough of it? I dont think so.