Real damage of Microsoft's Monopoly power. They have a severe case of Not Invented Here syndrome and even for free Open Source Software refuse to ship any of it naively unless they can fork it and pretend they wrote it (early TCP code based off BSD IIRC).
It's horrendously tough to target for a cross-platform application when you have to bring the entire GUI toolkit along and adapt it individually to every target, even the 95% of the market gorilla that is whatever versions of Desktop Windows are the most recent 3.
Electron; ship a whole web browser as your cross platform toolkit. Worst of all worlds, but at least you pick the browser version... wait that's horrid for security!
It's horrendously tough to target for a cross-platform application when you have to bring the entire GUI toolkit along and adapt it individually to every target, even the 95% of the market gorilla that is whatever versions of Desktop Windows are the most recent 3.