The one UI invention many web UIs now add is the universal command search bar. I’m most familiar from it from Jetbrains IDEs where it’s been for over a decade and it is a remarkable upgrade on browsing menus. With the KeyPromoter extension on I even learned the keyboard shortcut over time. Good UI pattern and now this universal command search is everywhere: Cloudflare, Mercury, etc.
Love it.
Similarly, under macOS in most apps ⌘⇧/ opens a full menubar search which can surface most app functionality from the keyboard. Not quite as good as a command palette but close, and devs don't need to do anything to opt in except populate the app's menus properly.