I was surprised when the PowerShell team announced that Out-GridView made a reappearance in PowerShell Core, built with Avalonia. So at least someone at Microsoft took notice.

I'm really rooting for the project to gain some support. Right now I'd love to try porting our custom UI component at work to Avalonia, just to try it out. But that's time not well invested in something with little backing and potentially few customers for us.