Cross platform GUI libraries suck. Ever used a GTK app under Windows? It looks terrible, renders terrible, doesn't support HiDPI. Qt Widgets still have weird bugs when you connect or disconnect displays it rerenders UIs twice the size. None of those kinds of bugs exist for apps written in Microsoft's UI frameworks and browsers.
The problem with cross platform UI is that it is antithetical to the purpose of an OS-native UI in its reason of existence. Cross platform tries to unify the UX while native UI tries to differentiate the UX. Native UI wants unique incompatible behavior.
So the cross platform UI frameworks that try to use the actual OS components always end up with terrible visual bugs due to unifying things that don't want to be unified. Or worse many "cross platform" UI frameworks try to mimic the its developer's favorite OS. I have seen way too many Android apps that has "cross platform" frameworks that draw iOS UI elements.
The best way to do cross platform applications with a GUI (I specifically avoid cross platform UI) is defining a yet another platform above a very basic common layer. This is what Web had done. What a browser asks from an OS is a rectangle (a graphics buffer) and the fonts to draw a webpage. Nothing else. Entire drawing functionality and the behavior is redefined from scratch. This is the advantage of Web and this is why Electron works so well for applications deployed in multiple OSes.
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Cross platform GUI libraries suck. Ever used a GTK app under Windows? It looks terrible, renders terrible, doesn't support HiDPI. Qt Widgets still have weird bugs when you connect or disconnect displays it rerenders UIs twice the size. None of those kinds of bugs exist for apps written in Microsoft's UI frameworks and browsers.
The problem with cross platform UI is that it is antithetical to the purpose of an OS-native UI in its reason of existence. Cross platform tries to unify the UX while native UI tries to differentiate the UX. Native UI wants unique incompatible behavior.
So the cross platform UI frameworks that try to use the actual OS components always end up with terrible visual bugs due to unifying things that don't want to be unified. Or worse many "cross platform" UI frameworks try to mimic the its developer's favorite OS. I have seen way too many Android apps that has "cross platform" frameworks that draw iOS UI elements.
The best way to do cross platform applications with a GUI (I specifically avoid cross platform UI) is defining a yet another platform above a very basic common layer. This is what Web had done. What a browser asks from an OS is a rectangle (a graphics buffer) and the fonts to draw a webpage. Nothing else. Entire drawing functionality and the behavior is redefined from scratch. This is the advantage of Web and this is why Electron works so well for applications deployed in multiple OSes.