This ship has long, long sailed. If you don't spend your all your 24 hours as an office worker using Microsoft software, or you're locked in with a PC from 30 years ago, chances are almost every single UI you use will look differently, besides some microscopic agreements, like back button or a burger menu.

We just got used to it. There is some very vague thin layer of "commonly accepted patterns and symbols", but otherwise users just get through it.

We spend a lot of time using different browsers. As far as I know there no web engine that use native OS UI for rendering.

In practice it's much harder to maintain a native app. I am noticing this with ChatGPT Mac app vs. Codex Mac app. ChatGPT on Mac is constantly behind compared the web ChatGPT while Codex is shipping features at a much higher velocity.

Also ChatGPT hangs and has more weird bugs compared to Codex.