[sorwin]

I think they may be referring to WPF, it promised so much, and it was great - then it was just left to die, and Microsoft moved on to MAUI

[alternatex]

Actually they moved onto UWP, then they moved onto WinUI 3. Now all this talk about MAUI but they have done zero dogfooding of it. People are sceptical of WinUI 3 but at least they used it in Windows 11.