johndoe@gmail.com and john.doe@gmail.com are obviously two different addresses. At least for me. I don't see why the first one should receive mails from the second one.
If you don't want to use the feature, you don't have to. Lots of people find it extremely useful.
https://support.google.com/mail/answer/7436150?hl=en#zippy=%...
> if your email is johnsmith@gmail.com, you own all dotted versions of your address
> If anyone tries to create a Gmail account with a dotted version of your username, they'll get an error saying the username is already taken.
> Your account is still private and secure. Emails sent to any dotted version of your address will only go to you.
Note: my bit of research into this taught me that the googlemail.com domain is used by Gmail users in Germany, Russia, and Poland where the Gmail trademark was already taken 1. In each case, Google was forced to use “googlemail” and therefore googlemail.com instead. As of 2012, the situation with Germany was straightened out and new users to Gmail there get assigned a gmail.com domain.
If you have John.Doe registered, no one can register johndoe or any with or without dots version.
Gmail (rightly or wrongly, whatever) ignore the dots when creating your account and deliver any with or without dots combination to you.
You’re not receiving anyone else’s mail and no one could have registered another account with/without dots to conflict with it.