This design is really odd. Vampire Lord's wings serve no purpose - he's levitating with magic, not flying. They're only there to look cool (and they don't, in my opinion).
Yes you really point it out, same with things like coffins, the "real legend" Vampires, are undeads that are rising in the night from their graves/coffinsm at least the typical one, but for the ones in castle Volkihar I see no reason why they should sleep in coffins, it's just there because they addopted a cliche.
Same with the architecture of this castle and the ruins, they don't treally fit to the world in my opinion, it's also exactly this what you would expect when you think of the usual vampires, also same thing with the bats.
And yes this vampire lord is really odd. I just remember how Harkon says; "Perhaps you need convintion, behold the power!" - and I just though - now you are ugly and crippled, geat thing, How would it be if they more attopted the Ice vampire idea of volkihars, if they would transform in some kind of special Iceghosts, something impressive and unique.
When I first saw the vampire lord in the Game Jam video, I thought that's just a joke and would it never made into the game, at least not as a DLC, maybe as mod like this "space core".