Maybe for you, certainly not for me. If someone is (in charatcer) a powerful warrior who went toe to toe with Mannoroth and Archimonde himself, with mog they can look like a powerful warrior with skulls and mother fucking pauldrons the size of small cars. Or humble, plain armor and armaments for the contrast. Or all green, with green clan tabard and green themed weapons, because it's their thing. Or whatever they choose for RP purposes. Without mog? They look like a clown on a 10 minute coffee break, straight from the fair. Guess which is more immersive for me?
Community cohesion and mog? What does that even mean? Like... community in a guild? Has nothing to do with mog and everything to do with the types of content available. Server community? Also has nothing to do with mog, it was a byproduct of no LFG and no xrealm - misery loves company, after all.