OK. I understand what you’re saying, pretty sure.
And agree, to the extent that “girlfriend-seeking-mode” is (great analogy/phrasing, BTW!) some kind of hidden pretext or “secret” one is hiding from the “other.”
But, there’s a danger in over-complicating this “strange tropical dance done by the natives!” I don’t see any difference at all, as long as there’s honest, typical communication.
Which, yes, includes being receptive to the concerns of the other.
But I will state pretty frankly that, as a single relatively young guy myself, although not actually looking for a LTR, there’s never not a time that I’m not “DTF.” And, I know that all of my coworkers and friends know this, including the single or married, or partnered women, so, let’s say half or more of the people I encounter most days. And, sure, my boss’s boss’s boss (a woman of about my age) knows this…but we get along fine. “Hey, you! Everything going OK?” And so forth.
I’d be hesitant to create too many subcategories of “types of modes of seeking behavior” and so forth. For me, there’s only one “mode,” and it just isn’t a problem. It takes just a second or so of casual “Hey! Name’s Blahblah” for it to be already out there. That new coworker? Yes, she knew I was checking her out, and I’m sure exactly the same from her to me, and then it’s already decided. Done. We met, and I welcomed her to the team, she knows my game, and that’s that. She knows that I know that she knows that I know that she knows &c. And it’s finished, so we can go do our own tasks and so forth. Maybe more, maybe not at all.
Just as much, one doesn’t want to collapse all relations into “one thing”…however, I find there really are just about two types of “conversations” (including everything nonverbal involved): honest, and deceptive.
As to how that relates to random people on a streetcorner…not much different. IMHO. The conversation’s already half over if you reach over to grab a box of…cheetos, or whatever…at a grocery store, or restaurant or whatever. “Oh, pardon my reach, miss.” It’s no thing. Person who leads with their chin is looking to get flattened.