I think the other side of it for me is a completely different approach to those visuals. Star Wars, as you note, is a fantastical universe that was set far away from our current reality, deliberately so. There was no connection to Earth in any particular way. It was set up as an archetypal story. To misquote Yoda "You only find what you take with you." Star Trek is completely different. It was directly connected to humanity of present day. And the technology and abilities to express that technology would be updated constantly. TMP is the most glaring example, but there are efforts to expand upon what technology was present. What this often does is go against the idea that Star Trek is a unified whole in a way that it really was never intended to be. Star Wars does its best to be that bigger whole, but it was never connected to present humanity the same way.