It's concerning the humans as a whole. I'm still waiting for your retort re: Tien. I'd accept the fact he's not really human as a rebuttal though. Dude does have three eyes.
After the Saiyan Saga they slowly lost relevance. Tien had that one moment against Cell and Yamcha got impaled by Gero but besides that I can't really think of too many moments where they held true relevancy.
It took all of them to defeat Vegeta when they first encountered him on Earth. He wasn't insignificant, in fact, he was their greatest threat until the arrival of Frieza. It's a bit silly to underscore that battle in that way also considering they also nuked him with a spirit bomb to boot and he...