I see no reason why they could not bring in some of the races described above like the Acosians (Frieza’s race), Androids (like Cell), Makyans (Galic Jr’s race), or the Shin-Jin race. The races that are currently being used in DBO aren’t exactly leveled the same as they are in the Manga or Anime. A Super Saiyan wouldn’t have a chance against a Kid Buu… yet in DBO they’re equal. It wasn’t until Goku went SSJ3 or fused with Vegeta that he could compete with Kid Buu.

I horribly disagree with you
Honestly I think adding tails would be a great idea! Saiyans are stronger with their tails so that would be a huge bonus, and of course they would be able to go great ape. Don't you think that would kinda balance it and not make the humans (saiyans if they add tails) the weakest race anymore? Really Most of the OP pple are either Namek or Majin.

It should be fine adding the extra races anyway so pple can make more choices and feel more comfortable with the class they chose. Plus the new classes and abilities.
Do I need to say more?

i love the haircut idea maybe it would cost a coupme million zeni

OMG no they are not! The only thing is, they can transform into Great Ape's with their tails. Even in Great Ape they can still get powned! Cut the tail off like Yajirobe did and they are useless!

Let me rephrase that, Cut the tail off the Great Ape, and the saiyan that just lost his tail is useless. Like Vegeta. Before he turned into Great Ape, he was weaker then he was without Great Ape.

If there where barbershops it would only work for humans think about the poor majins and nameks out there especially ULIMATE MAJINS

I don't think you've played a lot of games with barbershops lol. Every race can customize their hairstyle when they create their character. The idea behind a barbershop is that whenever any character of any race comes in, they can switch between the hairstyles of their race.