WidebandO2 Question

Hi i'm just curious, why can't we just use a car's factory WidebandO2 sensors for data logging and tuning? Is it just because HP Tuners doesn't have the drivers to interact with the output? Is there some reason they can't be data logged through a factory ECU when reflashing? It just seems like alot of extra work to have to install aftermarket Wideband sensors and gauges when modern cars already come equipped with them.

If anybody could give me a better idea on this it would greatly help me get setup.