What if I told you bookmarks and tabs have a lot of overlapping use cases, and people prefer one or another because they have different workflows, or just as a matter of personal preference?
Not the slightest! I can perfectly fine live without them, but I would be a little bit sad if they were gone. It happened once after my OneTab extension got somehow corrupted.
So you're saying that pressing 2 on screen buttons, then closing a page is a better solution than creating a group then dragging in and out whatever you need? Sure, I use the bookmarks bar too, but it's not for stuff I'll remove after a while, those are perminent, but tab groups are generally for stuff you will eventually close, but wantto sort in the meantime to make it more convenient.
If you don't have a use for it, fair enough, I don't either, but it is a genuinely useful feature for some that can't be replaced by more clicks.
Sometimes I ended up with +50 tabs because I just don't close them. But when the computer restart and Firefox ask me to restore them or start a new session, I always go for a new session. And I never felt that I lost something.
I used to never close tabs and they would accumulate as I kept doing more web searches and other activities. Now when I need to do stuff I usually open a new window instead for different tasks and if I need to free up RAM then I start closing other windows for tasks I'm not doing anymore so it closes all of the related tabs at the same time