> The term 'hey guys' may very well be materially 'inclusive' enough that it doesn't warrant intervention necessary.
That's not a decision made unilaterally by speakers and writers of the language; it's a decision made by those listening and reading, as well. You can't decide how your words are perceived; you can only choose what words you use.
> Some people draw the line at
Some people don't think of language in terms of "lines", as though saying "fine, this far, but no further". Language is a living, changing thing; every piece of it is interpreted in varying ways by different people, and those ways change over time. Using it, like many other human interactions, is an exercise in modeling others around you, and the net effect you want your communication to have to its many audiences, and the environment that communication will create, and all the connotations it may convey. When trying to record that in a dictionary, it may round to a few broad buckets or categories, but the language as it lives in people's heads seems more continuous than discrete.
That's true of all communication, not just specific words. If you tried to plot individual words or phrases in meaning-space, some of them would have fairly sharp well-identified points where the majority of people agree, and some of them would have fuzzier boundaries, and some of them would have multi-modal distributions. And even that oversimplifies, because it's entirely possible to model people at multiple depths, "this is what the speaker means when they're saying it, this is what parts of the audience are hearing, this is what other parts of the audience are hearing", such that your own model of some communication is a mental model of many interpretations.
This pattern applies in many different cases, and people do it all the time: predicting whether your audience is likely to know a particular piece of jargon from your field and comparing that to the value of the jargon or the need to define/explain it; accurately conveying levels of confidence/certainty/uncertainty; considering whether your audience will know a meme; attempting to come across as professional; choosing the right vocabulary level for the audience; making a new piece of terminology; naming a program or project; making a pun.