In my experience, unless the project is a money grab, developers decide what to finish, what to abandon and where to put/remove resources based on overall consumer interest, and KSP 2 just didn't really seem to be getting any real attention. In my opinion, this is because of that high price tag.
I own KSP 1, purchased it when it first came out in Early access, Think I gave like $5 for it, purchased it again later for my kids gave like $15 for each copy. purchased the DLC's I think $15 each on those. Given what KSP 1 is, I would have paid the $40 to get the final product and still purchased the DLCs later.
But to me, with the shape it was in and apparent lack of communication from the developers, the $50 price tag on KSP 2 smelled like a money grab so I stayed away, and I'm willing to bet that many people did the same thing. Had it been $15-$25 I would have considered purchasing it, had it been $5-$10 I would have purchased it without a thought.
To be honest, If they dropped the price to $10-$15 I would still consider purchasing it in the state it's in, in the hope that they would transfer the game to another studio rather than abandoning it, but I don't see them lowering the price, and I'm not paying over $25 for any game still in development because that reeks of trying to get as much money as they can as fast as they can, I usually see this kind of price with Early access games that the devs know aren't going to be finished. Not always the case as there are other factors to consider in addition to price, but usually the way it works with this high of a price this early.