Is this really an issue? I mistype my email address regularly but it is never the period that is wrong. Clearly the author believes it is and they have more ex

Is this really an issue? I mistype my email address regularly but it is never the period that is wrong. 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).