I hear a lot of songs (popular or otherwise) that have the same 4 or 8 bar loops throughout the entire song, and the only parts of the composition that changes are the components that are layered within the song (percussion, arps, leads, countermelodies, you name it). When it comes production or composing in any way, everyone tends to say the same thing: get out of that loop. There are so many articles/videos that tell us how to get out of it but don't give a good reason as to why other than your song will be boring. But considering the amount of songs out there in the world that have stuck with their loop that are successful, is that a good enough reason to get out of it?

My question here is why do most people agree that we should get out of the loop when it's clear that a song, with enough elements to switch it up, can still do well if we stuck with it? Is it a matter of what we think the non-producers/musicians want to hear? Does genre dictate whether we should stay in a loop or not? (I ask this particular question because I listen to a lot of hip hop-influenced music, so I wonder if that has something to do with it).

I'm honestly curious and would like to know what you guys think about this.