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If they go back to non-floating tabs, you’d save like 2-3px per my screenshots. You seem to want more than that, and that’s where the accessibility issues come up.
“Others do it just as bad / even worse” is just not a good argument for making your own software worse imo.
They have other things to consider as well, such as accessibility. You can’t just eliminate all whitespace without consequences.
I do agree it should be easily configurable, but my point is that they’re better than pretty much every competitor, so I’m satisfied.
How did floating tabs improve accessibility over the previous design?
If they go back to non-floating tabs, you’d save like 2-3px per my screenshots. You seem to want more than that, and that’s where the accessibility issues come up.