I'm not convinced you're making a point. Physical skills are also something of a rarity. Not as rare as technical administration, but manual labouring tasks are demanding and not for everyone. There are a lot of unfit, old, young or weak people who I wouldn't want to see hauling dirt because they aren't up to the challenge and wouldn't do a good job. Similarly there are a lot of clueless individuals who I would not want setting up -arr demons professionally.