Not so much looked over, it’s just out of normal case use for most users. But I also don’t see any harm in having more default options.
But anyway, you can use Zoom or Reduce White Point to achieve this dimmed display, with the latter being a bit easier, but both can be made very accessible with Accessibility Shortcut.
For the latter, go to Settings > Accessibility > Accessibility Shortcut and select Reduce White Point. Then go to Accessibility > Display & Text Size - then toggle Reduce White Point on, and set it to 100% or whatever level you require. Now you can just triple press the side button to toggle it on and off.
You can do the same with Zoom as well with Accessibility Shortcut, but with a few extra steps. You can even add both to Shortcut, and choose which one you want to use.
With Zoom, you can three finger triple tap the screen and toggle the filter there as well, with the popup menu.
As mentioned panoramic images can go up to 60+ MP, because images are stitched together horizontally. MP count is relative to image size, so the MP count goes up.