But there one is risking blowing out his highlights with the practicals! Charles Papert posted about shooting night scenes at high ISO's with Varicam LT and then having to be concerned about the street lamps.
In situations like that night club party, you still need the high ISO capable camera (Canon has that FF 1080p model that retails for ~ $30,000 but where you can shoot with the fireflies) but, with the narratives, the cost of lighting gear has plummeted with the same speed as other electronics. Technically speaking, there'll be several hundred dollars in cost difference between GH5 and (the new and unused) A7s, which can buy a lot of lumens these days.
Absolutely right. Need to make sure your light sources are out of the shot shooting high ISO in the wild.