mozart, and Classical era classical music in general, is an easy target. it’s ubiquitous yet unhip. by lambasting it you get to play the rebel without actually risking backlash—unless you’re talking to an orchestra violinist or an old person.
back in the day on /mu/ there was this contingent of young, obnoxious, highly knowledgeable classical fans who would ridicule anyone who found mozart et al boring and saccharine. by saying as much, you were instantly outing yourself as a dilettante, a “pleb” who lacked the discernment to read beyond the music’s pleasant, easy to swallow exterior to access its true depth and power. so instead of liking mozart being basic, it was not liking mozart (and being into edgier modern composers like penderecki and xenakis) that was disgustingly basic.
of course, everyone on dissensus is old enough and smart enough not fall for that rhetorical game. but as a method of trolling insecure teens who probably derived some fragile sense of self worth from the idea that they had good music taste, it was incredibly effective, and a pretty impressive feat of inverse-inverse-snobbery.
yet i think there is truth to that perspective, and it gets at what i meant earlier by saying i couldn’t get into mozart. there are works of his i find beautiful (probably like the one you posted, spendy, i’ll check later) but my engagement really is superficial. (learning the basic forms used certainly helped, but it’s still only an initial step.)