Conflicting requirements stemming from the psychological illusion of movement spontaniety.
People don't want the realistic, slow response. Normally people aren't aware of how early their body starts a movement, the conscious brain has the illusion of just having decided it but it's actually started much earlier.
That's it, there's the tradeoff; if they want legs to move naturally, they have to fight against what the user inputs. There's a setting in the Witcher 3 so that the character can turn on a dime / instantly, less realistic but more fun / responsive: https://www.escapistmagazine.com/difference-between-standard...
