> Then why would 'she' (the PC/feminist recommended alternative) be any more legitimate ?

Some people use 'she', which has the advantage that it tries to normalise women instead (not kind to others, but it makes you think, at least), but it's still exclusionary, yes. I'm not sure if it's fair to say it's the 'PC/feminist recommended alternative'. Certainly some advocate it, I don't know if they're a majority (I don't think so?). I know that the tool under discussion, `alex`, uses gender-neutral language ('they') instead. I also use 'they'.