> because it supports second-person plural via "Y'all" exactly as mentioned in this article... "you guys" is, to some ears, sexist

Many people nowadays are happy to use "singular they" to refer to specific, definite individuals whose gender is not in question, and seem not to worry at all about creating ambiguity with the ordinary plural use of "they" (despite frequently doing so). So why would they care about being able to distinguish singular from plural in the second person, either?