I believe cooling is the exact reason the diesel Gladiator tow less, not power or weight (same engine tows more in heavier Ram).But they may not have figured it out enough for the diesel gladiator with the significant decrease in tow rating. Obviously there is a weight difference of the engine but not 1600lbs worth.
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The 3.6 NA gasser is right on the cooling limit, with the highest power brushless fan they have. With a diesel, you now have an intercooler, so won't keep up pulling the same weight. That's why I wonder if the Bronco has the same limitation.