Earlier quoted context omitted.
It comes down to cultural norms, really. Where I am, a plain brusque "Do this" is rude. You act that way to people you really dislike. So the social interaction is you come up to me and are deliberately hostile and then order me to do something. That's what you do to an employee you dislike and wish would quit. Obviously I'm capable of understanding different people communicate differently, and I can deal, but that's…
So does everything have to be phrased as a question for you to feel better about a request? Aka "Hey Jim, can you tackle this issue?"
It's less about the wording than the information it conveys, that you respect someone enough to talk to them politely and make the effort.
If it's hard to see the difference, would it make sense if I made an analogy? Your girlfriend texts you "call me? :)" vs. "Call me."
One is clearly flirty and in a good mood and the other could be angry? upset? urgent? The extra punctuation conveys information about how that person feels.