> I'm of the opinion that if you have to be "trained" to find a work aesthetically appealing, it isn't inherently aesthetic.
I don't see how this is tenable, given how much aesthetic taste is learned regardless.
A lifetime's journey through arts, if done with any thought at all, is certainly a process of learning, of training. Efforts to defend old favorites in light of new knowledge will be attempted, sometimes succeed and allow new levels of appreciation of already-experienced work, sometimes fail when one discovers that the work lacks the substance on which to defend it. Maybe one continues to like the work anyway, but understands its limitations, its shortcomings. Learning, or training, happens, taste refines, horizons widen, new works become accessible, and the process repeats. Sensitivity to the arts develops, informs other areas of life. This doesn't even need to be the result of some kind of formal arts crit/appreciation training; informally and casually but thoughtfully engaging with art will allow (perhaps slower) progress of the same sort.
However, a similar journey taken thoughtlessly is trained just the same, but arrested. The hardened aesthetic taste of the latter is still "trained", just poorly, probably in part accidentally, and with training halted or slowed at some point, leaving the remaining guiding tastes and opinions unchallenged, surviving favorites unexamined and unexaminable as the approaches and knowledge required to even begin are undeveloped and unknown. Why did the author include this particular character? Dunno, never thought about it. Must have wanted to is all. Did you feel the prose itself change pace as the action waxed and waned? Sure didn't, this book sucks and was boring. headdesk. OK, how about Encyclopedia Brown? WTF no, I used to like that but now it's boring too, give me some good fiction for adults like Stephen King. Not Dan Brown though, he's terrible. Oh, and why is he terrible? Just boring is all, and I don't like the way he writes. Ah, OK.
So, trained, advanced to a point, but arrested. Which is fine, we all pick our battles, but I'm not going to take the latter subject's aesthetic judgement very seriously or consider that anything they fail to enjoy is necessarily aesthetically lacking.
I guess we can quibble over your use of "inherent" but I can't see that ending anywhere other than "nothing a 2-year-old doesn't find aesthetically pleasing is inherently aesthetic" which doesn't strike me as a productive direction to go, however valuable the beauty of nature and child-like wonder may be.
Point conceded on philosophy though. Some of the most painful reads I've managed to complete were philosophy—More's Utopia in particular nearly broke me, and definitely wasn't worth the effort.