Don't touch my bookmarks! I have all my tabs in my headspace at all times, I need bookmarks to mentally organize my stuff in the short-term/long-term category.

If bookmarks are deprecated I'll have to save workspaces made up of a single page and I'll just feel silly.

Edit: Plus you can use bookmark folders as workspaces already I guess? I don't but you can, fairly easily!

Merge, not replace. If there's a special bookmark group that dynamically contains current tabs, then you have the best of both.

Let a group of tabs be a bookmark folder that has the "show" attribute set, and so dynamically tracks what is shown.

Want to show all tabs in a group/folder? Toggle show.

Bookmarks sucks ! link rot makes them useless and it's time consuming and tedious if not impossible to manage when you have a lot of them.

I use wallabag instead which is basically bookmarks with a local snapshot of content that you can easily classify and sort.