D'karr
Adventurer
But D&D for the most part has been shackled to that. It has refused to get away from a tidier version of Middle Earth.
Lord of the Rings was great. But it is not the beginning and end of Fantasy. It should not be.
I agree that LoTR should not be the ultimate measuring stick. However, I see nothing preventing anyone from "unshackling" from that trope. I do it routinely and mostly without any problem. Eberron seems to do that too. But the party of heroes doing heroic things trope should not be something D&D distances or separates itself from. I think that is one of the main reasons D&D has been so successful for over 30 years.
I think the problem with D&D might be that it will try to emulate itself rather than generic fantasy tropes.
For specific campaigns the campaigns settings should change the tone. D&D Core should stick with mostly generic fantasy/sword & sorcery.