From my limited experience with D11 - I would say it’s a lot better, but still has issues with some language features and with navigation. Like most new features in Delphi, it needs a few versions to get up to standard.
I’m still using the Classic code insight in 10.4 - with all it’s issues, it still works better than LSP - navigating between projects in a project group in particular. They have removed Classic from 11 so it’s LSP or nothing.