I think my main annoyance with the new unified extension menu is that I can't hide certain add-ons, I still want them to work and do their thing, but I don't necessarily want to see them in the extension menu.
This is affecting us the people who like to use more than 2-3 add-ons in our browser. For example the decentraleyes addon is doing a great work in the background however I don't really need to interact with it so I would like to hide it from the addon bar.
In the previous overflow menu we could just drag them out from the menu when in customization mode. It would be nice to be able to do that in the new extension menu as well or at least hide them.