I resent reaching for the mouse to file something I already decided to keep.
I build Markwise, so I am biased. Question mark opens the cheat sheet. Cmd+K is search. Cmd+Shift+K is quick actions on the page. The results list is not fully keyboard-driven yet. That is the gap.
Which app actually got shortcuts right for you?
Markwise is at markwise.app. Free tier. Chrome extension, web app, iOS.