Since it's so flimsy and insecure, you should guess so you can prove how insecure it is. Alternatively, you could fail to do that, because 10 guesses is safe even against an awful password.
> I will absolutely say that a distro making that claim should not worry about the difference between 3 and 10 password attempts on sudo (i.e. when you're already logged in).
If you'd like to point out that it's really important to require a high-entropy password for the lockscreen or disk encryption, then I'll agree, but that isn't the argument we're in right now.