I understand they focus on low latency in general, but why it's not customizable and no one allows to tweak/switch what you prefer? Youtube streams etc lack int

I understand they focus on low latency in general, but why it's not customizable and no one allows to tweak/switch what you prefer? Youtube streams etc lack interactivity of videochat. It's just I'm sitting in the same building with another person, on the same wifi with multiple hundreds of megabits/s available to us, using powerful phones/tablets and there's nothing that can deliver good quality of video? Seems weird.