Interesting. 99% of the tunes I do are drops offs. It allows me to allow ample time for cool down between pulls and get other things done around the shop in between. The next day we also dial in cold start which cant be done the same day.
Don't think Ive had but a handful of customers actually want to stick around. They are more than welcome to and we can do it while they are there if they wish but never had that specifically requested before.
I do get it, but I guess it comes down to trust.