I think it would be really helpful if the Plugin Manager showed when the last update was (either last github release or last commit). There’s still a bunch of stuff in there that hasn’t been updated or optimized for Glyphs 4 and it’s kind of hard to tell until you install something and then it crashes or just doesn’t work.
Maybe there is even a way for developers to indicate if they’re plugin has been updated and tested in Glyphs 4 and you can show that in the plugin manager. I think it would help a lot.