Then there is this article, Instead Of Saying 'Hey, Guys!' At Work, Try These Gender-Neutral Alternatives, which highlights how language is changing even today.
My first experience with this was the early 1990s. After entering the civilian workforce, I switched from saying "manpower" to "staffing" to make it gender neutral. Today we are in a he/him/she/her [and sometimes they/them -- Editor] world if you look at the signature blocks for many a government person these days. Get used to it or retire. If it is a fad, it will go away -- but, many an emergency manager thought that social media was a fad that would go away too!
For the record, I recall asking women in the early 1990s if it was OK to use the term "guys" when referring to a group of people. The response, back then, was that it was considered gender neutral. Change happens!