I had to create an account to respond to your comments regarding the A7III and the Ninja V.
Oh nah. That's a negative. It can definitely not be classified as massive. I have both an a7III and an Atomos Inferno..while there is a difference, it is negligible. Here are some examples here and here comparing XAVC-S vs ProRes . And once you upload the video online and youtube has its way with it, the difference with compression artifacts are even more negligible. The money you invest in an external recorder for 8bit Slog2 would be much better invested in an other things.
Yah. If you are shooting 4k...you can't really track faces reliably. The LCD on the back of the A7III goes off and you get no green box on the external monitor. Sure it "tracks" but in more of a "I pray this works" sorta way.