The blue light protection is mainly done on panel optimizations.
The shudder glass' primary purpose is to mask the limitations of the lcd panel to allow panel to reach optimal saturation. (Essentially it is part of the 4k's customized low persistence)
The blanking effect imo is also used to trick the brain into believing its seeing a higher fps then is being rendered. Also gives mini breaks from staring into a display. (likely why able to wear longer without fatigue). The 5k/8k i beleive achieves this by controllering the backlight to "flicker".
Without the shudder glass the display will indeed be brighter as the shudder glass when active/clear is not crystal clear.
Another effect is increased smearing/blur.
Gamer/nightdriving or polarized glasses will improve visual effect to some degree.