There's a subset of people that likes collecting tabs and thinks it's some impressive measure and I've encountered them more and more recently, I guess as some attempt to brag that their computer can handle something? It's like saying you have 30000 pieces of junk mail in your living room. It's just sloppy.
30000 tabs is about 10x as many pages as there are in the entire Harry Potter series. Nobody remembers all pages in those series. Nobody remembers why they have 3000 tabs, much less 30000.
It’s also a pretty useless metric since modern browsers suspend stale tabs aggressively these days.
No need to be obnoxious.
I noted the tab count because it's a weak measurement of memory requirements, which is directly relevant to the topic at hand.
I keep tabs because they're better in most ways than bookmarks. I'd be happy to expound on that opinion, but I suspect you're unreceptive.
FWIW, Firefox with Sidebery can handle more tabs than you or I need. Someday I'll clean them out, maybe, but I don't need to. Thanks to Mozilla, Apple, and Sidebery.