Well, that brings up a broader point of psychology - does it really matter?
For example, if you read what you said and regret it/find it difficult to continue the conversation does that change what you do next? In my case, does that mean that I don't ask for a pretty reasonable request for fear of confrontation? Ultimately, even if the conversation did delete on their side too, there is no guarantee that you wouldn't be talking with the same CSR you previously got annoyed with - but should that change your request today?
Typically, I don't get annoyed when dealing with people, this was one exception because of the way that Hyatt was blatantly making up rules for the Diamond status match (which despite that chain I still went on to get). The reason I don't get annoyed is that it can later frame the conversation, and offers no value to me.
It really is all about framing of your mindset (and the situation) for the optimum resolution.
I'm not sure what you're trying to say here, but lemme venture a guess: you're concerned about how YOU feel about the past convo and didn't wanna see it when you started this new convo/request? that's perfectly fine and understandable.
I was just pointing out that you didn't really delete any DMs (the way you might have intended w/this article.) also psychology aside, Hyatt or any given service provider isn't gonna treat you differently, based on a past Twitter DM convo. I mean if they're professional and everything. that's why the ans to your first Q: it doesn't matter if its deleted or not. and thus wouldn't change my next interaction/request with a faceless corporation
p.s. even if it was the same CSR replying to you, they get 1000s of requests week in and week out. dont think you were that memorable enough to stand out and for them to remember you specifically
lastly, completely agree w/how badly Hyatt handled that promo. I pushed back 3 times for being matched, denied the first 2 times. still waiting for a response after the 3rd try, always gotta #GoForBroke ... BTW, how did you convince em to change their decision? or how exactly did you get em to eventually match you?