@wizardmanperson you'd be hard pressed to find many examples of actual classical architecture at all, unfortunately.
If we're being technical, there's classical and modern and also vernacular architecture. Whereas classical is about a strict grammar (Palladio), modern is about one-upmanship (as soon as rules emerge, they are thrown out), and vernacular is more about function and material, which is why it plays a subordinate role today.
big housing projects use modules quite a lot, yes.
The issue is that they are not classically proportioned or decorated anymore.
I looked this up for illustration, but apparently the OG commie blocks under Stalin were! Stalinist architecture follows classical rules. Never knew this.
pic 1 is the first ever modular commie block house, pic 2 is Stalinist architecture