Xamarin has reached End of Support
dotnet.microsoft.com
dotnet.microsoft.com
In nutshell, I think that MAUI has some pains to get used to, but when you make it working on one platform, it usually works on remaining platforms as well. Only thing which I don't like is HUGE binaries it generates (60-200MB) but I guess that's a price to pay for simple deployment on multiple platforms.
Avalonia looks pretty nice, but I've never tried it so I'm not sure how it compares.
https://www.reddit.com/r/Bitwarden/comments/1b32bbz/going_na...
Plus on Apple platforms it relies on Catalist, while most likely it will never do Linux.
Additionally, now outside of Windows, the best Microsoft can think of is using VSCode, or let JetBrains do the needful.
As such I don't see it to gain adoption beyond the .NET shops that were already deeply invested into Xamarin.
He is now focused on Apple technologies due to the way the acquisition turned out to be.