Um, Actually, I am a developer.
I agree with you that it's not always enough. But you're making an all or nothing argument. I find it disingenuous.
Developers with more experience throw in some accessibility features.
It is a hard problem, but that's no reason not to make an effort.
I find the whole "purity of artistic vision" argument privileged and ableist.
Software can do better than other art mediums. Accessibility is worth striving for.
Developers who don't add accessibility aren't some high minded artists, they just haven't fully mastered their craft, yet.