Making some things sleeker is one thing, making it look like it came from a different universe/franchise is another. Naboo gets more leeway but the Republic in general should not look as different as it does from the Empire, aesthetically speaking. We are not talking about that big a time jump, and the idea that this is the heyday of the Republic is deeply misguided - this is the downfall of the Republic. The series’s iconic approach (used universe) would not have been out of line for the PT at all.
The other big thing too, it’s not just ship design and architecture, it’s the costumes. Again it makes sense that we’re seeing fancy outfits that we haven’t seen before, but there’s ultimately little continuity in costume design on the whole. Unfortunately that is not as easily fixed in an edit.