There's a bit of confusion here. Importantly the GP is talking about "professionals." My post was written with that in mind, and the assertion that "...almost no professionals... shoot on manual mode outside of studio...Instead, shoot on aperture mode..."
The important distinction is that "manual mode" is being discussed and compared to "aperture mode." So it's about the PASM setting and not specifically about "true manual mode" (auto-ISO or not). The clear (and in my view incorrect) assertion of GP is that manual priority/mode is not for use outside the studio. It is said three times:
> I know almost no professionals who shoot on manual mode outside of studio settings.
> The only time manual mode is used is when you're in a studio...
The important distinction is that "manual mode" is being discussed and compared to "aperture mode." So it's about the PASM setting and not specifically about "true manual mode" (auto-ISO or not). The clear (and in my view incorrect) assertion of GP is that manual priority/mode is not for use outside the studio. It is said three times:
> I know almost no professionals who shoot on manual mode outside of studio settings.
> The only time manual mode is used is when you're in a studio...
> Leave manual mode for the studio.