I don't particularly mind if Trump wants to stay off of email. What bothers me is that a lifetime of isolation against computers makes him almost entirely incapabale of understanding or prioritizing information technology, and I don't just mean things like Obama's fluff campaign for learn to code.
This isn't a fault particular to Trump, of course. Anyone who isn't using technology will likely have just a facile understanding of its full impact on life today...kind of like how it's nearly impossible to understand Twitter's appeal (or at least, differentiate it from other forms of publishing, such as blogging or mass email) without using it.