It's not a rhetorical question. Why if the showings are both valid, can the Hulk manage something a vastly more powerful being, ostensibly, can't manage, despite having maimed Strange far worse?
There's an easy answer and it would be "well, that's likely not valid then, given the Hulk being wildly beneath Dormammu". Alternatively you could try and reconcile it by saying "the Hulk is vastly more powerful than a guy Strange giving his entire all at the height of his powers can barely fight." In which case, feats for that?