Dragonborn, as I understand it, are considered to be one of the weakest, if not the weakest, playable race. Their flavour is cool, especially for people who like dragons, but their being sub-par in terms of balance can be off-putting.
Furthermore, dragons all have darkvision (by which I mean "true dragons", those listed under the "Dragon" section in the Monster Manual), whereas dragonborn do not, and this has always bugged me. I know that dragonborn are humanoids with dragon heritage, but if their heritage is strong enough to give them scales and breath weapons, surely they can see in the dark?
Anyway, the point of this is that I am considering adding a darkvision racial trait to the Dragonborn playable race (specifically, the standard 60 ft. of darkvision as per most of the other playable races). How would this affect balance? I doubt it would overpower them, since darkvision isn't that strong, but where does this see them when compared to other races?
I don't necessarily want a ranked list of all playable races, but would this change see the Dragonborn race still quite underpowered, about average and on par with some of the better balanced races, or does this push them into the above-average-but-still-not-overpowered, such as the Mountain Dwarf? In other words, I want to know if this makes the Dragonborn race more attractive to players without making them too much so.