I've tended to using "they" in this fashion over the years, with some discomfort. Given the folks who have as well, though, I will probably less uncomfortable about it. After all, as I was commenting the other day, grammar is both prescriptive and descriptive. #ddtb
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Dogma vs. Evidence: Singular They – Lingua Franca – The Chronicle of Higher Education
I promised I would return to the vexed topic of using they or them or their with singular antecedents. Your holiday homework was to re-read the first act of The Importance of Being Earnest and comment…
faith-based grammar–love that idea, but not as one to emulate