Almost everything has a context.
The truth is that the nature of Pop Music is a direct reflection of what we have become as a consumer market. It has become "louder and blander in terms of chord progression, melodies and rhythm" because we have become that way. Pop Culture is more 'Two-Dimensional' than it was in 'Prior iterations of The Matrix'.
For instance, a music producer might say "Well, I'm from the old school and I like the music back in the day". Yet, if that same producer gets a request from an artist or record label to do a "Katy Perry sounding" record, the necessity and expediency of his or her financial circumstances will more than likely draw that producer right in, ready for work !
We are the quintessential "Quick Fix" generation and we can't help it ! We lose interest quickly, want more and more and are hyper-critical of what we would define as 'sub-par' at any given moment. Our modern sense of music reflects this sort of hyperbolic mindset.
Pop music does EXACTLY what it is designed to do: Reflect the mindset and desires of the generation that supports it. If some find modern Pop Music "louder and blander in terms of chord progression, melodies and rhythm" in a way that displeases them, the problem is not the music. The problem is that the listeners perspective has been type cast. They have become idiosyncratic.