It’s more efficient but much less reliable. Like if you change from light to dark mode, there’s a 20% chance all UWP apps that are open crash.

And as efficient as it is, it still can’t resize windows without flickering. It’s worse than WPF or Win32. And there still aren’t proper APIs for configuring the titlebar area.

I wish they focused on getting their vendor partners to make efficient processors, rather than try to get all windows developers to rebuild software to run on hobbled ARM hardware.

That doesn’t explain why they had to roll a new framework instead of improving WPF. It may have been ok if they provided an upgrade path but since Winforms they haven’t bothered with that either.