I can see that, but plate armor was prominent in the later middle ages too, pre-Renaissance. And D&D has no gunpowder weapons, which were starting to be common in the Renaissance.
Then again a lot of "medieval" movies/TV/games mix Renaissance stuff in.
the DMG has Pistols & Muskets, and there's also Laser Rifles in at least Rime of the Frostmaiden. They just tend to not get used cause they don't really fit in the rest of the setting.
Then again a lot of "medieval" movies/TV/games mix Renaissance stuff in.