I feel like it’s because tv sets have more dynamic range now, and cameras are more sensitive, so there’s less reason to compress the brightness values into a narrow, bright range. After all if the tv set has really dark darks and really bright brights you want those to pop. You want to use that if it’s available. If cameras are crappy and tv signals are noisy, then the lighting has to be really bright and the picture has to be really bright too in order to see it at all. We’re just used to a very low quality signal.