Sacrosanct
Legend
No, I'm not asking for a rule or mechanical bit or missing class or race. I think we all know how that turns out 
Instead, I'm asking what bit of lore or flavor/fluff from a previous edition to you prefer over how 5e has approached it?
For me, there are a couple:
1. I don't like the approach the did with gnolls and making them the whole demon tie in and whatever. I liked gnolls to be when they were fairly vanilla humanoid evil monsters because then it was easy to make each tribe unique without having a common background
2. I prefer kobolds to be dog faced, as they appeared in the 1e MM
3. I prefer paladins to be as in AD&D, when they fit what inspired the class. None of this evil/bad paladin stuff as a generic accepted class

Instead, I'm asking what bit of lore or flavor/fluff from a previous edition to you prefer over how 5e has approached it?
For me, there are a couple:
1. I don't like the approach the did with gnolls and making them the whole demon tie in and whatever. I liked gnolls to be when they were fairly vanilla humanoid evil monsters because then it was easy to make each tribe unique without having a common background
2. I prefer kobolds to be dog faced, as they appeared in the 1e MM
3. I prefer paladins to be as in AD&D, when they fit what inspired the class. None of this evil/bad paladin stuff as a generic accepted class