I'm not so sure, as stated most people don't seem to care. Then it just comes to CYA. People are going to buy the truck and do what they are going to do with it. Manufacturers want a way to ease liability. Ram, especially under it's new ownership probably isn't as brave as others. I don't recall the older rams (like until mid 2k) being any less competetive than the others.
The people on this forum are far more scrutinizing than the general public. I see numbers for payload and towing capacity thrown around here all of the time. I hardly ever hear anyone talk of this outside of here. I know many people that drive trucks (and work them, hard) that probably couldn't tell me what their gvwr is let alone their tow rating.
These are farmers, contruction company owners, and just general "truck" guys. I used to ask a lot of questions to people like this because I am always curious, but after countless "I don't know" responses or shoulder shrugs, I quit asking.