They were musical theater at best. ‘The Sound of Music’ isn’t opera either.
I was not that impressed with Pink Floyd etc. but I admit, after hearing “Money” 100 times, it got old, and if they did write/perform better music, I missed it. I will give them credit for part of the song being in 7/4 time, but other than that, I did not think it was interesting. I don’t even think my drug-influenced friends at that time were aware of the time signature. They just found the clink/ka-ching sounds entertaining.
Who knows, maybe they have learned something after all these years.