"Crotchety old men seem to have won this argument.
Modern pop music is too loud and does sound all the same, just like angry old types have been saying for 70 years.
A team from Spain analyzed music from a 55 year period, using an archive known as the Million Song Dataset, and found that songs have indeed become both louder and more homogenized in terms of chords and melodies."
The Million Song Dataset - Science Concludes Modern Music Too Loud, All Sounds The Same