As one such masochist, I hesitate because the tabs aren't tabs. I'm not saying there should be tabs, but this is different. I tend to see a page and open interesting links in new tabs, so the tabs to the right of the current tab are related to this tab. So, there's a tree-like organization to the tabs, even though they're presented linearly. In this browser, that kind of information seems lost, at least in its stock configuration.
Windows are also about particular topics, but here all windows have all buffers available.
The fuzzy search doesn't really do anything for me. I'm not really interested in seeing e.g. all Amazon tabs together. I'd prefer to see some Amazon tabs that are about particular selections of books next to other tabs of various URLs and titles that are also about those particular selections of books, and in the tree/linear-like order they were opened in.
Also, the tree-like order isn't always from following a link. I may, for example, check out a book on an Amazon product page, and a reviewer makes mention of other similar books, so I may open tabs next to this one that search those titles somewhere (DDG/Amazon/etc).
If I were to make this usable for me, it's probably by automatically keeping record of what buffer I was on when I opened a new one, then making a buffer that presents this information in a modifiable tree. The fuzzy search can be replaced by a search in this buffer. It would simply scroll to the spot, so I'd have access to ancestors and descendants from the match.
A benefit of generalizing to buffers rather than webpages is that presumably I could make simple placeholder buffers that act as parents representing topics where I would have used windows in the past.
Also, I'd need keybindings to walk the tree like Ctrl-Tab and Ctrl-Shift-Tab. Maybe also a way to set the root node for a window, to limit the navigation of Ctrl-Tab in it.
Another thing is that it also facilitates closing tabs when one's done with a topic. Firefox has "close all tabs to the right" for that, though one can also middle click a tab repeatedly until enough tabs have been closed to close a (sub)topic. The buffer tree would simply need to have some "close this and descendants" type of option.