I agree with everything you have written on here, AngelCityOutlaw. I have said the same things for a few decades. I have written many posts on Youtube songs as well as other music or musical gear sites.
Just because something is complex in no way means it is good. And if something is simple, likewise, does not make it good.
The 3-chords of the vast majority of Rock songs does not make them good. There are many that are, but most are not.
I've written a few times that the playing proficiency of Jordan Rudess (Keyboardist from Dream Theater) is to be envied. But the guy knows nothing about composition. Or maybe I should write, "His compositions suck".
Being able to play a thousand notes fast without error is truly something to be envied. But if the riff or stanza sucks, it sucks and shows nothing of merit for the song.
I love a large number of pop songs, but let me take a sentence to define what I mean by "pop". I mean the songs that were hits on the radio. BTW, I stopped listening to radio in 1988 because I gave up on it. Nothing worthy of my listening time was being produced and I was constantly assaulted with trash that the populace embraced.
The intelligence of the world listening society began diminishing severely by the end of the 1980's, and while there were still a few good bands and songs that "somehow" made it to the top of the mediums (I'm still not sure how I ever heard of Collective Soul, which came out in 1994 and I own about half of their CD albums), the vast majority (almost 100%) of music being played on the various mediums were dismal.
For the record, I believe Beethoven was the Master of composition, but I do not like all Beethoven. His latter works stymie me. But up until that time (probably because he had gone totally deaf) Beethoven combined both Intellect and Good Feeling in all of his compositions. And they were extraordinary. Beyond amazing. Intellect as was given to us by Bach and Good Feeling (the beginning of the Romantic era, most notable in Chopin). When listening to any of Beethoven's music you can recognize brilliant intellectualism, and are amazed at how wonderful they sound (feel good) at the same time. The same cannot be said of the vast majority of the eras' composers that this thread started off naming for all the periods.
I also 100% agree with your comments about the past 100 years of corrupt academics. That it could even possibly be imagined that Math Music is something, I hold with such total disgust (head shaking left to right)...
Oh, one last comment. I read a news clip from a critic who wrote that he had heard Mozart play and thought that nobody could ever be better until he watched and heard Beethoven play (around the year 1800, if I recall) and he said that hearing Beethoven was like hearing the devil himself.