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.

And the Romulans, by the TNG era, have ships that invert everything about the Federation's design. Instead of the two squashed spheres connected by a thin hull, with engines out on spars, they've got a bulky central "head" and then an almost hollow sphere, the nacelles being the central joining.