True, but we usually don't see many Atlanteans get to strut their stuff outside land. Only a few kinds of strength feats you can really pull off underwater.
Well, that and he's the main character. I don't think they've ever said he's naturally stronger for being a hybrid because his telepathy is usually seen more as his unique feature then his strength even if I don't think every Atlantean can hold their own in Supreman's weight class like Arthur can.
It also probably helps that Mera was trained to fight (Arthur was self-taught).
This reminds me of that Brave and the Bold episode where Aquaman is trying to avoid fighting crime to go on a family vacation and then Mera and Arthur Jr. decide to join him in stopping some thugs and they clean house .