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Its about engine and optimisations.

Bethesda makes Fallout4, and their reknown for makeing badly optimised & glitchy games (still good games).
Doom 2016 is made by id Software, a company known for great optimisation.

Its about how tallented the guys are, at optimisation that work at each company.
How willing they are to work to do so. How highly they prioritise it.