I used to be a tree-style-tabs power user but at some point I went back to regular tabs. I find that the amount of horizontal tab space is pretty close to the actual number of things I can usefully have open at once. Seeing the tabs get "squished" is my reminder to close the ones I no longer need. I was using the tab-state as a sort of short-term working memory and I don't think it was doing me any favours, particula…
I actively use tree style tabs, and have dozens to hundreds. With auto tab discard, it's not taxing. This is because I basically use tabs as bookmarks relevant to a project or subject area. Bookmarks are also tree-structured, but are much more high-ceremony to create. To my mind, tabs and bookmarks should meld into one. If you don't close a tab actively, it stays deactivated, its tree likely gets collapsed until need…
I can see the appeal of this, and more broadly, not having to think about tab management. But for me, I find I actively benefit from the process of deciding what to keep around.