Hey fellas, could you help me understand a bit more about HDR?

• I understand that it's an absolute brightness standard, not like the relative levels in SDR
• But why does it end up washing out colors unless I amplify them in kwin? Is just the brightness absolute in nits, but not the color?
• Why does my screen block the brightness control in HDR mode but not contrast? And why does the contrast increase the brightness of highlights, instead of just split midtones towards brighter and darker shades?
• Why is truehdr400 supposed to be better in dark rooms than peak1000 mode?
• Why is my average emission capped at 270nits, that seems ridiculously low even for normal SDR screens as comparison.

Cheers 😊

Edit: It's a QD OLED