Not nearly enough? Are you sure? 90% of monitors are 350-400 nits. People watched Plasma TVs in bright rooms and these were barely 100 nits.
I have a very bright room and I watch SDR content (around 300 nits) on my OLED TV with no problem.
He's being a bit ridiculous. Most people don't even run monitors anywhere near their max brightness even if it can do more than 350. I remember when the first Cinema Display came out and we were blown away with how eye searingly bright it was... and it was only 180 nits.