[Sephiroth]

Originally Posted by Chris

‘They’ is also perfectly acceptable third person singular for referring to an individual whose sex is unknown. It has been co-opted by those who wish to make a deliberately ambiguous statement about their ‘gender’ but that shouldn’t stop you using it as grammar has long permitted.

The problem here is that people will tend to match the verb to the plural sense of the word "they" (where action is the context). Thgis can theoretically lead to the need for clarification - which is wasteful effort.

The rules of grammar are there for a reason and wokery should not modify these. Better for some philological brainio to invent a new word (singular/plural) to cover the trans case.