Somebody, please explain me, why out of blue it became fashionable to put that native-sounding flavour of an accent in games and movies even when its story assu

Somebody, please explain me, why out of blue it became fashionable to put that native-sounding flavour of an accent in games and movies even when its story assumes almost every character in it is a native speaker? I always find it disturbing. As every native Russian speaker, I tend to feel it perceive as beautiful and melodic. Just as any other Russian, Ukranian, Greek or whoever else. Sounds like a joke and not a good one. Makes me skip the whole title. Why are they doing it? Does it really help anybody with immersion?