On desktop that ship has sailed. Maybe 2 of my regularly used apps have a native design.
UIs have converged enough that the experience is acceptable I guess. And as a devolper, why in the world would I want to write my app for a locked-in ecosystem with a now shitty design-system.
It hasn't fully done so on the desktop when you consider macOS. E.g. if you ship a macOS app which has the main menu bar inside the window (or missing entirely) instead of using the system menu bar, it will look very jarring and users will rightly complain.