As someone who's been able to touch type for years, without even trying to learn, just typing lots, I didn't realise how few people could. It's why there is a bump on the f and j people.
Well apart from the fact that touch-typing isn't an instinctive skill, I cannot touch type due to a disability which affects my left hand.
So, perhaps it's better to assume there's a reason why people CAN'T do something, rather than expecting everyone to be able to do something just because you can.