They may care, however, if they get anything at all. I do not have the resources to target something to all platforms, so the alternative wouldn't be "Users get UI targeted towards their OS", the alternative would be "Users get nothing since developers don't have the time to also target their system".
> I do not have the resources to target something to all platforms
Some speculate that agentic engineering will enable the return of native apps
> I do not have the resources to target something to all platforms
What resources is actually needed? More often than not it just requires good engineering. You do not have to duplicate everything across platforms.
Time. I have the time to maintain a single GUI. I do not have the time to maintain three GUIs. Of course they'll be 99% the same, but checking that this 1% difference behaves and looks fine accross systems adds a substantial amount of effort that I simply can not support. And for what exacatly? I want them to be identical accross systems, not different.
> And for what exacatly? I want them to be identical accross systems, not different
For your users. Engineering is about designing things for the convenience of the builder, but for the convenience of the user.