This wait seems longer than previous years. Past few years, we get something in November or December, then get hot patches until February or March. That does not seem that will happen this time, that is, more than one year before next release. I know of the disclaimer.
As for development, it takes me a while to do stuff (and I need to budget my time)... although I need to learn other programs (e.g., Blender and GIMP for models) to make my assets. Being occupied with my own projects means I do not want to spend too much time playing Starsector (because I cannot play other stuff).
Putting Starsector on Steam now is a bad idea, thanks to brutal early-game difficulty, unbalanced (and unfinished) skills, enough exploits to twist combat, and no satisfying endgame victory condition (e.g., you destroyed all factions and now dominate the sector).
...relies on the modding community to do it for him.
I have seen this since the '90s. This is why I prefer a solid base game. If I need mods to make a commercial game good, then it is a game engine posing as a game at best, or blatant or sloppy cash grab at worst. Either way, not worth the money.