Cambions in the current edition are iirc all half-devils.
Are you sure about this?
It's kinda a mess IMHO, I try not to think about it. But I wonder if we ever saw Haer'Dalis in BGIII-if he'd be retconned into being a red skinned horns & tail tiefling.
Agree, the 4th edition spoiled the appearance of tieflings. It's only more offensive that the fifth edition decided not to change anything. Even the fact that in BG 3 we can choose the color of a tiefling's skin depending on its subrace is an progress, because in the rulebook all subraces were red and horned.
By the way, more than Haer Dalis, I'd like to see Doomguard or other factions of Sigil.