This is incredible what you do ! I also saves some webpage thata are important to me, but still have the URL saved in my booksmarks, as duplicate entry if you like.

Because they are important, I have an organised collection of bookmarks which can be saved and archived outside the browser. A bookmark list is just a structured html page that any browser can export, import and share, unlike tabs. I have lot of themed bookmarks folder, for the future.

With so much work to organise your tabs, why make you not use bookmarks instead ? Do you have a lot of RAM and SSD on your computer to save all your tabs ? Your browser needs to keep a copy in RAM for you. The more tabs, the slower your browser runs.