Some shows are very "of their time" and Trek is one of those. The mini-skirts, the bee-hives, the men's hair, the fashions, the blocky buttons and big computers and so on. I myself like that, it's sort of like an extra layer of stylization, like it's the future but through the eyes of the 60's so it's like exploring two worlds.
Not everyone cares for that though, many people are just very in the moment. A lot of people aren't even interested in anything imaginative, calling any such efforts cheesy, let alone with an extra dated element. Like how BSG is vaunted for its "realism" because everything looks like the 2000's instead of some imagined future.