If you've every played Forza (or hell, destiny) the xbox triggers are leagues ahead of a ps4 controller. You can get that bowstring action today on Destiny 2.Are you being obtuse on purpose? Because even ignoring the fact about variable tension, haptic feedback is not at all like rumble feedback and offers far more nuanced information than two small motors occasionally rotating at same speed.
I doubt it's anything different
If (the tension changes) as in a spring tightens or something (sounds like a fucking stupid idea and an easy way for a controller to break) I'll be very surprised