You're right, but something about the design language strikes me as too similar. I especially hate the monocultures ST writers seem to create. I really liked the designs of the Klingons in Undiscovered Country, showing that they are just as varied as humans are.

That's fair - but, counterpoint: Here's Vulcan, Tellarite, Andorian, and Denobulan ships, the four species that founded the Federation with the Humans. I definitely feel like these are visually distinct design languages, each of which suggests something about that species' sensibilities.