They realised this by EpII and started making the vehicles more textured. Although the Trade Federation and the Chancellor’s ship at the start of TPM are more in line with what you’d expect. The problem is that everything is so busy looking in art direction terms. The Jedi Starfighter and other clone wars vehicles are really overdesigned, instead of being simpler reduced versions of what would follow. A lot of them look like what would have been post ROTJ. You can see some of them are intentionally made to look like 1950s cars in an attempt to reach for that “retro” aesthetic but I don’t think the results work.