Homogenous design is a good thing. The internet isn't nearly homogeneous enough actually. The mid-90s desktop apps got it right and we've been regressing ever since then because web designers are like kids with crayons.
Look up in an old city, look at the facades of the buildings. They have quirks, uniqueness, it makes the city almost a living thing. Every time we shave off another edge we lose that. Nevermind the fact that shoehorning everything into the same patterns is actually an antipattern and very good paradigms have been invented after the 90s.
It's not perfect, but I'd rather have a bit of a mess than boring emptiness.
Facade are to be looked at, not to be used. Most things that are to be used in a practical manner has retained the same basic form: desks, chair, handle, cart, cup,…
Dunno, I have been in IKEA and saw 50 types of drawer handles, for example :)
(Same for car interior design, or things like even doors that some swivels on one axis, some split on multiple, some slide.)
I don't think that us humans really actually like/want standarts. We think we do, but there are 100+1+1 standart from which to choose. So Claude becoming "standart" iš just +1 standart to choose from. Unique is fun!
UI Design is an art. Like any other art, it's bound to have constant currents and counter currents. More than the designer's whims, it's the population's need for novelty, generational differences, and the desire of companies to stand out what is driving the wheel.