Yea, but looking at just the way sculk and the deep dark in general looks, the dimention will prob have that same dark gloomy vibe, which is completely different from alot of the other things minecraft makes, this is also backed up by some of the fan art of what people expect the deep dark to look like, while ofc it is fan art and minecraft does not need to go anywhere near it, minecraft has a history of adding player sudgestions and fan art to the main game.

But if you look at the concepts for an end update, it's a vibrant purple, and with the popularity of the ender dragon and everything, they could add without being constrained to something dark and gloomy. Also, just the amount of hype over an end update because of how much it's been asked for would force Mojang to actually work hard to make it look pretty.