This strikes me as a particularly un-HN-like comment. Accusatory tone is not a valued conversational technique here.

Be mindful of not slipping into the more emotional tone that some have observed nipping at the edges of the HN community.

(I don't mean to sound as if I'm speaking from a position of moral superiority, nor expertise with regard to the topic at hand. Just an observation and suggestion.)

P.S. For the record, I did not downvote anything. That is coming from elsewhere.

I can hardly afford the time it would take to do that.

Besides that, I think my assessment of the situation is solid. It is much more cost-effective to make your developers (who will follow you, as they have huge investments on your platform already and wouldn't be willing or able to switch) move the direction you want than move in the direction they want. In their position, being able to do whatever is convenient for them regardless of how inconvenient it is to their users, I'd do exactly the same.

It's a delicate act of balancing your inconvenience of moving along with your vendor and your cost of migrating to another. As long as the second half is kept high enough, they can do a lot of inconvenience on the first.