That's awful point. Darkvision is not about how good or bad the player can see through game visual effects, it has mechanics related to attack and sneaking.
I'm well aware of the implications, you either can't attack or you have disadvantage on attack, etc. But that wasn't my point though. My point was we don't know how often we will run into areas that require dark vision. If only two optional dungeons require it then not very valuable but it there are a dozen dungeons and some very important areas require it then it has much more value.
