The tabs pile up, not because I hoard them, but because the task has not been finished yet. I start researching a thing, or troubleshoot a problem, and I dig for some time.

This digging generally routes me to places of internet not found or shown by my search engine of choice, hence if I close that set of tabs, I'll lose another half day to find them.

However, I can't touch that set of tabs, because a small or another big, more urgent thing gets in the way. I move that tab set to another window and start over. When the task at hand completed, these tabs/windows are closed.

The ones that piled over? Save that Windows's session, label it "X Research", and go on.

What that research or task ends, some tasks got bookmarked, others got closed, and the saved session is deleted.

Internet is much deeper when compared to 00s, and the most valuable information is not on the first page of Google/Kagi/whatever most of the time. Hence the apparent hoarding.