Now this I agree with. I kinda hope that Darkvision goes away in the 2024 revision, but, I'm pretty sure it won't.
Making the access to Darkvision be by means of a cantrip for certain species, means it is easier to regulate the number of species with it.
The only species who should gain Darkvision "biologically" are who?
• Dwarf (sunless, underground)
• Duergar (dwarf)
• Tiefling (creature of night, fiend)
• Dragonborn (snake infrared)
• Orc (creature of night, mythologically of underworld)
• Tabaxi (cat nightvision)
• Yuan-ti (creature of night, fiend)
• Triton (deep sea)
• Shifter (cat nightvision)
• Kobold (sunless, underground)
• Vampire (sunless, creature of knight, undead)
• Dhampir (vampire)
That is pretty much it for player species with built in Darkvision.
These species shouldnt have Darkvision but include individuals who might.
• Wood Elf (British nocturnal fairyfolk)
• Drow Elf (sunless, underground)
• Shadar-kai Elf (sunless, Shadowfell, undead-ish)
• Earth Genasi (underground)
• Water Genasi (deep sea)
• Rock Gnome (fairyfolk underground)
• Svirfneblin Deep Gnome (sunless, underground)
• Aasimar (combat darkness)
• Hexblood (nocturnal Fey)
• Goblin, Hobgoblin, Bugbear (nocturnal fairyfolk)
• Owlin (owl nightvision)
• Aarakocra (owl nightvision)
• High Elf (no reason!)
• Eladrin Elf (no reason!)
• Astral Elf (no reason!)
• Thri-kreen (no reason!)
• Simic Hybrid (no reason!)
• Plasmoid (no reason!)
In these situations, where Darkvision wouldnt or shouldnt affect the entire species, it is better for any relevant individuals to rely on a
Darkvision cantrip.
In the case of an Elf community, a Mythal Background is a possible access to Darkvsion.