The Sharingan is quite powerful, even at just 3 tomoe level. When it becomes MS and then EMS even more powerful.Also, there's a reason why Sasuke had so many less outside powerups. Who needs outside powerups when your genes alone give you more advantage than most shinobi. Do you realize just how many powers that even basic sharingan and normal MS grant?
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That Dragon Ball example is a bad example. Goku also permanently lost the Ozaru power. I know that Goku couldn't control it before, but had he kept the tail, he could have eventually learned to control it.
Plus, you can't act like it is unfair for Goku to have Kaioken since Kaioken is a technique that Goku actually trained hard for and worked for. Vegeta did not work for any such techniques. You cannot honestly say that it's unfair that Goku has something that he worked for just because Vegeta doesn't have it (and he didn't work for that technique).
Also, Vegeta eventually got Super Saiyan Blue Evolution which matches Goku's Super Saiyan Blue Kaioken x20.
So no... Vegeta is not nerfed (unless you consider Goku, Gohan, and any other Saiyan that has lost their tail to also be nerfed)
As for Vegeta he must have worked hard to master his Oozaru form, since Paragus never seen anyone in control of their Oozaru form. He states every Saiyan loses control.
Broly has no tail or control of his Oozaru form, yet has access to Oozaru power.
I guess your right every U7 Saiyan who never grew their tail back or access to their Oozaru form can classify as nerfed.