And tabs are imho the perfect abstraction. This is misguided effort.
The issue is with the way multiple browser windows are managed. When I have many tabs I must have a way to manage many windows as well. Visually!
Whether these can and should be improved on a browser level I can’t say.
MacOS is already very very good at this and much better than anything else
I extensively use app expose and spaces to visually and spatially find what I need and structure my environment by projects and topics. I have everything I need exactly where I left it, together with all other applications and information that was related to it
Adding more management features should not be the responsibility of the browser. That’s why I‘ve never been a fan of any of the popular tab management extensions or browser features