Civilization sometimes sorts people having difficulties to easier classes, which will, of course exist and be optimized for that purpose to the limit of what very smart people can manage.
It doesn't leave them sitting confused.
There's a saying about cryopreservation which is "Civilization doesn't leave anyone behind." It's sort of a Good saying, so Keltham's not saying it in Cheliax, but the thought did run through his mind.