It's not about who's fault it is for me, I just don't like the inefficiency - I don't say "well, that's their fault for not being effective in their comms, so it doesn't matter that we've failed as a team". I understand that perhaps I should just let it pass me by and not give it any thought but it's hard to do that if for example they say "hi" on Day X and I respond later on Day X saying "hi" back, but they've packed up for the day, so on Day X+1 they respond saying what they want, by which time I'm perhaps really busy with something else but naturally getting more cognitive load from this additional ask that I could've dealt with the day before had I known what it was.
I've badged it as a 'pet hate' because it's one of those things I find annoying despite not being THAT big a deal.
In hindsight reading my OP, I probably could have been more explicit that it's the lack of info that is annoying not the fact they say "Hi", I'll edit that in at the bottom. Basically I view it like an email or voicemail (or to take to anl extreme, a letter), what's the point in just saying "Hi" in a professional context if you have no idea at what point the recipient will be in a position to read/respond to your communication.
