I don't keep hundereds of tabs open, but tabs do serve two purposes that are not covered by either the browser history or by bookmarks.
One is as a sort of ad-hoc to-do list. When I leave a tab open it's because something is unfinished and I mean to come back to it soon. (I just wish there was a chronological view so that I could easily delete the oldest tabs).
The second purpose is to store the scroll position of longer articles that I haven't finished reading.
Tabs are the RAM of my TODO list, my README bookmark folder is the disk. Every so many months I purge the README folder, while regretting never really learning Blender, GIMP, SVG, d3, Godot, Rust, Julia, React, Svelte, CSS, shaders, machine learning, wavelets, Ableton, ....
One is as a sort of ad-hoc to-do list. When I leave a tab open it's because something is unfinished and I mean to come back to it soon. (I just wish there was a chronological view so that I could easily delete the oldest tabs).
The second purpose is to store the scroll position of longer articles that I haven't finished reading.