> If they forgot a dot and received a "no such mailbox", they'd check and fix it.

why would they? do you think another person would not register fredflintstone@gmail and another user could register fred.flint.stone and another user fred.flints.tone

then you have lots of people using email addresses that are the same if the end user excludes the easily forgettable punctuation marks.

Your anecdote about one person who keeps giving your email address out does not mean that Googles dot policy is bad.

I can't expand any further on what I've already said so I'm going to leave the discussion