It's not like you're actively monitoring every tab at once, you just have the knowledge ready to go and at a finger's whim. You use extensions like Tab Hunter to jump directly to the tab you care about.
Yeah, you could do the same with using a bunch of profiles and bookmarks... but then you need to copy your login cookies and such and it just becomes a mess. I've tried many, many other solutions over the years and simply having a huge number of tabs is the one that continues to Just Work.
No, it's similar to saying "Surely there's a better solution than having 1000 radio/tv channels tuned on at once, waiting for you to decide which one is relevant"
Like why not open what you need when you need it rather than squirreling all those "maybes"?
I know I'm a power user, but I miss how effective old Chrome was at this.
For instance with HN, tabs provide quick navigatable references back to discussions that are relevant to my interest, and that might contain lead-off liks/references after they have fallen off the front-page.
I don't think the person you're replying to was referring so much to implementation details, but rather more to function for the user. What if the browser had better support for finding items that are open in tabs?
I don't know about other people, but I find it really useful to research a project and then leave it alone for a month or two before working on it. When I do this I often have a better perspective on the project than if I were to just jump in. With my setup, when I return to it my session is just as I left it; making it very easy to get up to speed.