I say this buying way more GMs and Fors then Rams/Dodge so dont think Im a dodge homer. And its all big picture. And yeah Ram has some older powertrains, but you really cant argue with cummins in the diesel world. Second Dodges 5.7 was way ahead in performance for a long time and other are just not catching up and still outperforms GMs 5.3, and has been a reliable platform. So i guess in a way like you said why fix it, doesnt make sense. My only issue is they only offered 3.92s for years in gears, which really isnt needed.
After buying all three, I can tell you GMs optioning is by far the worse of three, between colors and option combos it really is the worse. In many option scenarios on the chevy truck your stuck with getting what color you want but a limit on options or you can get the options but it has to be, red black, or white. Dodge also has many trim level so things get confusing when comparing apples to apples.
Another thing to keep in mind when these motors get bumps or upgrades. First thing is a lot of times these motors are already pushing that power and the company undersol it in years past for various reasons. Second with these diesels or any motor parasitic loss comes into play and as of like 21-22 duramax was actually putting down more power with less HP and torque. Plus with trucks another 50-100hp or torque is kind of red herring, its not always doing something, and transmissions matter as well as other things like rear ends. This is just marketing at its best and wouldnt get sucked into ford is pushing another 50 torque.