What happens when the photos are on Google Photos? What happens when they need to update their browser because theirs is outdated and becomes incompatible? What happens when one of their grandchildren sends them a YouTube link to their concert performance from school? I absolutely guarantee you that in each of these scenarios they will call and complain because their email isn't working.
They think that they only want email, but what they really want is to access the internet via their email.
They think that they only want email, but what they really want is to access the internet via their email.