For me, tab groups are nothing like bookmarks. Tab groups are a way of managing already open tabs in related group; showing and hiding groups as you need them. I use a similar tool in Firefox and I always have tabs related to about 4-5 projects open at once. I use the tab group tool to switch between the tabs by project so I only need to deal with 10-15 tabs at once.

These are tabs that I don’t want to close as they have context and sometimes ongoing edits. It’s a bit like having multiple windows each with tabs but this keeps it together in one window and makes it easier to manager.

Without this, I would be facing 50-75 tabs and trying to figure out which ones were related to the project I needed to work on at the current time.