Dots in gmail don’t count… and this is idiotic
medium.com
medium.com
Clearly the author believes it is and they have more experience than I but I just don't see how this can be a significant problem, it is less of a problem than the gmail/googlemail issue that many European people with old enough gmail accounts have (gmail was trademarked at the time and thus they had to use googlemail.com so I still have to use googlemail.com address for certain shitty systems that don't let me update my email address easily).
Yes, it is a pain for third-party apps doing logins or password recovery. That said, it would be possible handle gmail addresses as a special case, which I admit is annoying from a software developer perspective.
But we build tools, supposedly, to please customers, right? What do the customers want? From a user perspective, what Google is doing may be best. It is, after all, consistent with Postel's law / the robustness principle: http://en.wikipedia.org/wiki/Robustness_principle
People need to stop with this histrionic bs when it comes to engineering mistakes. Its not the end of the world. This guy needs to take a chill pill and calm down.
Also, it's not something they can "undo". A lot of people started with "first.last@gmail" and later started telling people "firstlast@gmail.com" (I do that now).