Posts about big boss are from PW which features a fight against Rathalos, that's not even from the same game.
Post apocalyptic shit is well, shit, but the elder dragons being gods is referenced to in some games as part of the story.
Also, psychic powers are weird to compare since we don't know how monsters control elements and stuff, technically they have to use their heads since the effects are not random and are controled by the monsters.
If you compare gamplay elements those two commentaries can be simply cleaned with one aspect from MH, armors. Armors have skills with a plethora of effects that can render most of the CU actions to shit. Also, having no need for stamina to attack would eventually break the CU because staggering is a thing and hunters, with the right skillset can take care of the fight much easily and have access to much greater mobility.
The one thing CU has above the hunter is the ability to not have to wait for his weapons to be seathed or unseathed and even that can be cleared with a skill.
These are gamplay mechanics that would make DaS a walk in the park but simply manage to make MH doable since there's a ton of bs gameplay elements around for both hunters and monsters alike.