I was surprised about vi going in, though, I didn't know it was in System V.
The standard definition of AI is that which we don't understand.
You can drive a car by looking in the rear view mirror as long as nothing is ahead of you. Not enough software professionals are engaged in forward thinking.
The reason I use ed is that I don't want to lose what's on the screen.
But no, I don't generally have trouble with spelling mistakes.
Most of the bright people don't work for you - no matter who you are.