For cross platform, from a technical standpoint Qt is one of best and that’s the problem. The best isn’t good enough, not for the masses that instead chose Electron and certainly not for the sorts of devs making polished Apple platform apps.

Developer experience is extremely important but it’s consistently something that’s swept under the rug with Qt, much to its detriment. Devs at large would rather be limited to a single platform or make huge tradeoffs in efficiency than live with bad DX.

The Telegram Desktop app is written with Qt, and I think they've done a pretty good job. I think there's a certain bias here. Most of the popular Qt apps are either open source or Enterprise software, both don't care much about UX and aesthetics. What I'm trying to get at, is that with some effort Qt apps can be on the same level (or very close) to native apps. That's what I aspire with my Qt apps as well.