I agree with this. I think it can sometimes be a culture thing. At my workplace, almost everyone starts emails with "Hi name", but we work with a third party and a lot of their staff start emails with just "Name". When I first started working with them I thought it was direct and a bit rude (some of their staff can be that way) but I think it's just what they're used to.
Mind you, I also work with someone who never starts emails with a greeting and never adds a sign off! She just launches straight into what she wants to say and that's it. So most of her emails are just one paragraph of text.
She's often involved in document approvals and will come back with suggested edits. The only problem is she never accepts anything other than someone taking all of her edits on board. So, even if you've got a really good reason not to make an edit that she's suggested, she just replies with a repeat of the edit she wants. Then, even worse, sometimes when you've made all her suggested edits and ask her for final approval she'll come back with more comments that she didn't raise the first time. I once had to escalate to someone senior and he just replied with: "these are now classed as approved, we've all had ample opportunity to comment and every relevant comment has been addressed". She didn't like it.