However it puts you beyond a certain level.
Nobody on Wano besides Oden and Zoro have been able to tame the sword
It is not really a power level thing. I think it is more will related or having something special.
Oden mastered it at teen age. At 18 he had a nice feat with it cutting the Pig god, but nothing DR Zoro couldn't have done with ISDS.
At 19 he fought bandits and Ashura Doji in a high/very high diff fight. And we have to remember that this Ashura Doji was quite weaker than the current one (he said it himself).
So at 19 Oden with Enma only high/very high diffed Ashura and his crew.