I've been wondering about that multi track thing w.r.t video live streams

Wouldn't it make sense to have separate channels for distinct content streams (e.g game capture, face camera, overlays..) so that you could independently choose/optimize each channel's compression and thus make the whole stream more efficient?

I don't know anything about compression algorithms, but I hypothesize that maybe now the algos would also be able to do a better job since the frames have less abrupt discontinuities (in the viewport perspective).

This would also enable stream viewers's to activate/deactivate channels when needed. For example, when the overlay/webcam/etc occludes the view on layer (channel) below.