I used to despise emails like that, but more often than not now I find the people who seen them aren't anywhere near so blunt/horrible in person and just seem to have developed that email style as a quick, direct way of communicating which I have no problem with. As others have said here it cuts out fluff that isn't really needed in every single communication, and in fact is sometimes blatantly insincere - which feels just as bad as including no pleasantries. If that person also spoke to me like that in person or on the phone that would be another thing.

I used to manage someone who was on the surface very nice but was a terrible slacker, and liar, about work and to boot couldn't deal with anything outside his very small comfort zone (telling people good news and what they wanted to hear - i work in certification and a big part of it is clients not meeting requirements first time, we did tonnes of training on how toapproach this but he just wanted to tell people the positive outcomes). He would fill his emails to colleagues and clients with 'hope this email finds you well' and no end of decorative phrases but very often skirt around the point of the email if was at all something that the recipient didn't want to hear or wasn't expecting. I would have rather he dropped most of that and been more direct and repeatedly told him that; he rapidly went through performance management and then left before he was sacked.