At this point I'm honestly hoping for a OLED MBP in 2023/2024. Even if it PWMs at 99% brightness and under, I would be fine to keep it at 100% and used third part/OS tricks to dim the display, assuming it was a true 10(or 12) bit display there for no dithering. I can use I phone X thru 12 at 100% brightness no problem, acutely my preferred device, dim it at all and the PWM starts and its a no go. iPhone 13/14 PWM at 100% and could feel it in the store almost immediately. Also, my 2020 MBP M1 is fine hooked up to one or more external monitors, however when I airplay via my Apple TV 4K on my Samsung 2017? 65" LCD TV, It'd not as bad as the MBP screen but here is some dithering or font smoothing or something that I notice being slightly irritating afterwards. Nowhere near like looking at the actual dithering M1 screen.
All that being said it seems like they could make it DC dim like any of these new OLED TVs that DC dim with just a slight dip in brightness every 8ms that coincides with the refresh rate and not full PWM. Although, I haven't spent much time in front of one of these, sounds good in theory though..