Honestly the Edge collections feature is fantastic for this, but it's hidden in a sub menu so it feels like they don't want people to use it.

They're like a hybrid bookmark and note taking feature, add a group, name it, add tabs to it, add notes to it, reorder it all, etc. Only thing it's missing is a way to turn a tab group or window into a collection and back again, it's a manual process currently (add/remote a tab at a time)