First of all, hi. Long time no see.
So I've skimmed through and I have a bit of a concern about new panel design. Tables are fine and all, but what about long multi-line messages? I believe some providers still use that (including atom-haskell stuff, provided user chose to use linter as a frontend). I've seen long messages in the tooltips, but for keyboard-oriented workflow this seems somewhat awkward.
Also a minor nitpick, but information about what provider generated a message is usually irrelevant, since there are usually one or two providers for a given filetype, so displaying it this prominently seems a little too explicit, don't you think?
Forgive me if you addressed these in the video, I'm in a bit of a hurry and sound on my system is kinda borked atm, so I'm writing this based on the video only, which I only skimmed.