I have used MAUI at my previous job to build 3 different apps, used only on mobile (Android and iOS). I don't know why many people dislike XAML, to me it felt natural to use it for UI, I researched flutter and liked MAUI/XAML more. Although the development loop felt smoother with flutter. What I didn't like was the constant bugs, with each new version that I was eager to update to fix current issues, something new appeared. After spending countless hours searching through the projects GitHub, I am under the impression that there aren't much resources dedicated to MAUI development from Microsoft, the project is carried forward by few employees and volunteers. If I would start another project I would seriously look into Avalonia. But I always was a backend guy so now at my current job I do server backend development in C# and couldn't be happier.
I do think server/backend is C#'s sweetspot because EF Core is soooo good.
But it's curious that it's used widely with game engines (Unity, Godot), but has a pretty weak and fractured UI landscape.