[methods21]

This will sound pretty dumb, but with all the amazing cross platform games written in Unity - which I thought was Mono or some form of cross platform library with .NET as one of the primary languages, I always wondered why there was not a more 'business app version' of this. After using Xamarin, Appcelerator, and dozens of other 'cross platform tools', with to be let down from ALL of them in the end and/or support dropped.... Having to support multiple platforms, esp. IOS vs. Android still seems to be stuck in the stone ages, esp. for small dev teams that can't allocate massive resources to multi-platform...

[bootloop]

Mostly because business apps have to appear similar to the platform UI. Games do not, they have to look the same regardless of the platform in use.

And making a cross platform app framework which looks like native UI is much harder.

In contrast, Unity's UI systems are all terrible and looking native isn't even one of their goals.

[dax_]

If you want a consistent UI (non-native look), your best bet may be Blazor Hybrid currently. Yes, it's web technology (with the overhead that comes with that), but at least it uses the native browser components, so it's not nearly as "heavyweight" as something like Electron. My main concern has always been the lack of Linux support, but maybe that's not an issue for you.