Backlogs, unloaded tab are functionally not that different from bookmarks so opening and leaving an effective and universal "watch later" function. I usually keep a dozen or two sorted from least to most interesting. Communications - I usually have email, discord, calendar, work email, slack, jira open and pinned at all times. Plus a few (container) tabs where I'm signed under different roles in a system that Im working on so that i dont have to relog all the time. Wikipedia rabbitholes on something like theoretical physics, research projects and shopping for something highly specific like car parts or niche hobby products can easily explode into 50-100 tabs where it's easier to have a ton of tabs for cross referencing rather than going back and forth every time.

But that's just my flow, others might have different needs and solutions

Well, I used to think like you too, having only active tabs I needed and bookmarking important stuff.

But now I have tabs, which are important, but not as important to bookmark them permanently. So I persist tabs across sessions now, because else my bookmarks are way too cluttered for my tastes.