It's not entirely invalid, however the Big 5 (OCEAN) model is robust and offers certain predictability, e.g. political affiliation. This is a huge topic that warrants definition of terms starting with the definition of "you" which immediately complicates things because when people typically say "yo...

I blame Fredrick Winslow Taylor

Next you're going to tell me you don't believe in astrology... I think different people have different traits and personality tests and types try to make a messy thing tidy by putting traits in boxes and matching it all up. I think they're fun and people certainly exhibit traits of a certain type or...

you're my type

It’s useless for people with multiple personalities