After rebuilding about 300 vintage bikes, you start to recognize the exact creak a loose cup makes. That experience made me switch to a specific thread prep paste on every single install now.
Hold up though - doesn't thread prep paste make it harder to catch those subtle sounds when something's actually loose? I've always felt like a little dry install lets you feel everything through the wrench, that direct metal on metal feedback tells you way more than a greased up connection ever could.