I hear you guys on hand washing. I try to hand wash whenever possible so I am 100% sure the cleaning is done how I prefer. As I'm sure you all know sometimes other stuff has to get prioritized over cleaning the car by hand.
Interesting speculation on the soap corroding seals. My personal speculation is that is a little bit of marketing hype from soap companies combining with typical OCD enthusiast paranoia. I would love to see tech on how the soap compares with the everyday smog / pollutants our cars are subjected to regularly anyway.
Now that I know the car's roof seals are tight enough for this particular car wash I'm going to stretch out my hand washes by maintaining the car at this touchless place.