I ended up blocking keyboard events from a userscript to deal with the keyboard hijacking. This combined with opting out of all the "feature previews" has made

I ended up blocking keyboard events from a userscript to deal with the keyboard hijacking. This combined with opting out of all the "feature previews" has made it more or less usable again for now. But the writing is on the wall, I am not using GH for any new projects.