Not having romance in and of itself isn't the problem. I've praised the Voltron reboot (and bemoaned the parasites from the Steven Universe fandom wanting nothing but gay romance, idiots) for not having endless romantic drama like say, Korra, which did and it sucked eggs.
The problem is the constant displays of titilation, sexual elements, and huge breasts, coupled with Oda indulging his macro fetish every other arc, are juxtaposed with most of the leads being asexual. It creates this utterly bizarre contrast that really cannot be addressed.