If one's Login password could be easily compromised, additionally allowing access to Keychain, it would seem a stronger, Login password would mollify this security concern. ...Am I misunderstanding your objective?
My objective is ease of use.
In any particular session, I'm extremely unlikely to have to enter my keychain password more than once, while it's a virtual 100% certainty that I'll have to enter my login/Admin password multiple times, so a complex password would be counter-productive...not to mention a giant PIA.