I can't believe how intensely functional the UI design of windows 95/98 was when looking back, and I say this as someone who intensely hates windows overall - but credit where it's due. Only when using it now is it clear how well they minimized ambiguity and cognitive load... everything is so frickin obvious. Contrast that with modern aesthetically obsessed UIs, ever ambiguous, lack of clear distinctions not in both…
I don't get it when people people use strong descriptors like "unease" and "jarring" when describing UIs. I don't think I've ever had a UI that made me feel fearful for my life/psychological well-being like that.
You are more likely to intuitively get this once you have some experience attempting to design effective UIs (and actually trying to care about it).