Monument

For one, the sources claim that the Start menu is getting a full rewrite in WinUI 3, which will make it 60% more responsive and notably more customizable.

Customizable for whom?
Users? Advertisers?

And just like everything since windows xp, it’s a an iterative change from the last version with arbitrary things that are broken and only about 3/4 of the way through the product’s life do the features improve to the around the level of promise that was initially made, save for the stuff that’s been removed or intentionally broken to stifle interoperability, or stuffed with advertising.