I think I remember reading that the plural used to be conventional grammar and was then deliberately suppressed in favor of “he”.

I use the plural. It grows on you surprisingly quickly and isn’t at all obtrusive. Anyone who doesn’t already have the info stored “Oh, Eliezer uses the plural” after reading my writings for months is a case in point thereof.

Use of the plural form also has the advantage of being the stylistic direction the language is trending to. English is a mass hallucination anyways, why stand in futile defiance of its whims?

The grammatical value of “they” used as a singular has been discussed frequently at the inestimable Language Log, including citations of the form used by such disreputable, notorious abusers of the noble English tongue as William Shakespeare and Winston Churchill. A good post.

From Player of Games by Iain Banks:

“Marain, the Culture’s quintessentially wonderful language (so the Culture will tell you), has, as any schoolkid knows, one personal pronoun to cover females, males, in-betweens, neuters, children, drones, Minds, other sentient machines, and every life-form capable of scraping together anything remotely resembling a nervous system and the rudiments of language (or a good excuse for not having either). Naturally, there are ways of specifying a person’s sex in Marain, but they’re not used in everyday conversation; in the archetypal language-as-moral-weapon-and-proud-of-it, the message is that it’s brains that matter, kids; gonads are hardly worth making a distinction over.”