I think it’s pretty clear, for account having lot of groups & pages, clicking to add to group etc is cumbersome, and people aren’t doing it. It quickly becomes a mess. A simple drag a drop to the left menu with all groups would be a very strong new features.
Hey there Ñ we’re in the process of planning quite a few improvements to how you can manage your pages. One of the big things we’ve heard is enabling nested groups (a group within a group) as well as the ability to re-group pages in bulk (whether is drag&drop or an easier way to select multiple pages at once and then add to a group)
No firm ETA yet, but the project is coming up soon for us. Thanks for your feedback!