[njsg]

IMHO you need to step back and consider that there are more views of design, you think some newer look is "more modern" and better in itself, you say "outdated past vision". But those concepts are subjective too.

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.