I will disagree with your "no matter how much dirt or dust is on the car". Nothing would be safer than a hose and bucket wash.
Nothing in this threads talked about a hose and a bucket, I thought this was a discussion about rinseless versus waterless. Obviously a hose and a bucket and flooding the car is the most complete safe way possible. Unfortunately that service that is not available in garage condos, apartments etc. In that case I’ll always believe the rinseless is better than waterless.