I think that's reasonable, and part of my issue. I want an srt competitor, the RT is fine but the SRT is better. Ford could have given us that for virtually no money.
That said, you gloss over the benefits of Durango pretty quickly. For people like me, that towing difference is a BIG difference maker. It's the difference from "I can probably tow my boat but I'm maybe a bit over the limit with people and gear" and "no problem towing the boat and stuff on top of it".
Durango also has more interior space, the option for better brakes, better infotainment, and a few little neat tricks like the storage bins in the floor.
That said, ST beats it on features, has a 40hp difference (which is kinda BS because the same motor makes 390hp in a ram). I'm not sure on outright performance numbers, but I suspect they're close with the ST having a clear advantage due to power and weight.
Heres my issue, Ford could have neatly split the difference between srt and rt Durango for next to nothing. Heck, they could have directly completed with srt for virtually no cost, it's just a tune and trans upgrade away, maybe some better brakes. Low cost, big rewards.
That said, I think that the St is compared to an srt Durango at all is a big compliment. It's punching above its weight class and price point, and it's just a disappointment to me Ford didn't go whole hog.