It is simple:
Subjectivist sometimes dont learn how to listen by themselves, and this is acoustic science training by the way... they trust more the branded name of the gear they bought than their ears training ...They train their ears distinguishing amplifiers marketed sounds qualities 😁😊
Objectivist are worst, they trust their measuring tools ONLY...Or they trust misapplied very limited blind test which are an industrial methodological statistical tool not a tool for learning concrete acoustic ...
None of them most of the time learn with their EARS acoustic concrete science in listening experiments...
Solving equations of acoustic is not enough in applied acoustic of complex small room by the way...Acoustic like medecine is an art based on science...