Well said Chris, I've always explained it to newcomers as with:
Cheap kit
'You think, you move, transmitter thinks(delay) then moves, receiver thinks(delay) then moves, finally the car moves (delay)
Decent Kit
'you think, you move, transmitter moves, receiver moves, car moves'.
No delay hence the car is doing what you want when you want and no delay as Chris mentioned which may only be a tiny delay but enough to effect your driving.
I've proved this trackside with a young lad pitting next to me explaining this delay issue to his dad who couldn't figure it out, I lent him my spare Sanwa MT4 radio gear, his laptimes instantly improved on the next qualifier, by the end of the 2 day meeting the father refused to give my radio back and just bought it off me instead
, the lad is still using it 3 years later and is getting pretty quick nowadays and doing nationals.