Originally Posted by
Lake1952
So I ask again... if an ILS GS signal isn't good enough for the electronics, why is it good enough for a hand flown approach?
Because the deviations are very transient and happen quickly so the pilot won't notice them (or if they do, they'll average them out).
An autopilot would instantly jump on each one of those deviations.
I've not done that approach myself, but that's how it was explained to me by someone that has.