Modern English dictionaries are not guides to usage or often even words even the New Oxford. After the Webster’s 2nd International the dictionary started entering everything that could be sourced to three speakers. Correct for modern dictionaries is whatever people use, in Boston or in Watts. They is third person plural. Period. If you want to give in to the leftist continuing restructuring and destruction of the language and thereby of thought processes- language being the tools of thought, then just go ahead and say whatever is handed down to you from a leftist academician.
“They is third person plural. Period.”
I agree with your view. When I go to a print version of a dictionary I go to my 4” thick Webster’s New International Dictionary, copyright 1968.
On the other hand, languages evolve, so we must accept a few new words and new word meanings. We need to know their meanings but don’t need to use them in our conversation or writing.
‘They’ is not just plural. It is also non-specific.
In any case, my pronouns are ‘I’, and ‘me’. Isn’t everyone’s?