I think I now understand the mentality of a Cybertruck buyer
Edit: I mean that it's cool in how it looks but yeah I would never buy Tesla because the products seem unreliable and dangerous as hell
I don't think that's a purely contingent association, either: with software, how the UI looks and how the functionality works are deeply intertwined, and I think there may be a more direct correlation between "modern" software being unreliable, unconfigurable, and insecure, and it having haphazard UI designs that lack underlying organizing principles or adherence to well-established conventions.
So your original complaint seems to imply almost the opposite of what you are saying here -- that superficial aesthetics are more important to you, even to the point where you'd accept poor functionality and user-hostile anti-patterns as a viable tradeoff.
I like the Modern SeaMonkey theme. I also like the look of the classic theme (not default, but the old default, sometimes called "XPFE Classic"). Not sure if just out of nostalgia or because it looks neat to me. What I value more is that SeaMonkey's looks are customizable. I don't know if it's customizable enough to make a theme that behaves in the way you prefer, but at least there is room for customization. (I'm mentioning this because I do think this is an interesting feature to have.)
So, please consider relativizing your position, it seems you're insisting on a bias against the design just because it is not recent enough, but also wording that as an absolute.
To me that sounds like people who say some train models "look old" and "have to be replaced" just because they feature Budd-style corrugated stainless steel.