WinUI – The modern native UI platform of Windows
This is  a subjective take. I don't know whether any of you share this concern but I feel like almost all new UIs are unattractive. (Maybe except Apple, and I'm an Android/Windows user). The new windows UIs are flat, colouring is off somehow (I don't have the lexicon to express what is missing), wastes lot of space, and appears like applications made for kids.Take the calculator application included with Windows 10. It takes time to load. Earlier it was instantaneous. It takes up way more screen real estate too. Maybe the new design helped them to make this app easier to use on touch devices, but from my perspective, in all other respects it is going backwards.