Definitely don't think the main goal to age momo is to make him broken powerful. It's to just make him older and more willing to fight. Having a dragon fruit could allow him to have his "dragon" moment with Kaido most people were expecting. It doesn't mean he has to harm him
Primarily what aging Momo does, is it allows him to properly kill Orochi. Ame is his blade, but he's too young to wield it. He was trained by Zoro and Orochi is a shit samurai, so it should be easily enough for him. Not only this, it now allows him to properly rule Wano at the right age and dismisses the idea that Yamato or any scabbard has to take care of him for 20 years, which it's appropriate because the final war is coming anyway