There's nothing inherently wrong with it, but it doesn't work well once you get beyond a certain number of tabs (the number will vary depending on your screen size, etc., blah). At some point, all the tabs are scrunched down to being indistinguishable blobs. Firefox, at least, doesn't have that issue, thanks to the scrolling tab bar. And the drop-down that shows all your tabs is, to me, a sufficient answer to the "my tabs are hidden from me" concern.
I understand that some people will feel differently of course. And it's less of an issue in the first place if you don't keep ludicrous numbers of tabs open.
>At some point, all the tabs are scrunched down to being indistinguishable blobs.
I don't know what you're on about. I opened the maximum number of tabs that my browser window can have visible (~90) and at no point were they indistinguishable blobs. Every single one still had a favicon.
To me, nothing but a favicon is exactly "an indistinguishable blog" since it does nothing to help me distinguish between the 10 arxiv.org tabs, or 7 or 8 Youtube tabs that I have open. shrug
This is something that bothers me when pair programming or working with co-workers who use a lot of tabs. I have to watch them fiddle between 10 jira tabs until they find the ticket. God forbid they misclick a few times (every time!) and then you get to see them hit a few other websites while all in the search of that only holy jira ticket tab.
I understand that some people will feel differently of course. And it's less of an issue in the first place if you don't keep ludicrous numbers of tabs open.