If you are going through a touchless and then wiping it down with anything, even if it is a microfiber cloth, you're damaging the finish.
Personally, I'll go through an automatic brush wash that doesn't strip my wax down occasionally. And polish and wax it 3 times per year. If I do that, any DD will look good for many, many years. I have a 2011 Town Car L with 154k miles and its been through car washes about 3-400 times. I polish and seal it twice a year. Unless you are a car show judge, you'd think it looks great...
That being said, if you are keeping your car for a very long time and want it perfect, hand washing with waxing 2-3 times a year is a must. My '04 V was garages and stored during winters. It was perfect, even to concours judges...
I find the thread on car washes fascinating and a little disturbing. I just traded my 12 year old Lexus LS in on an XTS. We live in Phoenix where the sun is some what harsh, however the car was garaged when not in use. Never hand washed or waxed the car just took it to the Chevron car was 6 or 7 times a year. When I traded the car in the Cadillac dealer remarked the paint looked like new. Maybe Lexus uses better paint?
If you really want the best exterior cleaning for your car try this.