I didnt even read, the imbalance of functions started because of racials 10 years ago buts its a minority problem, it continues because of the population imbalance since then, but has nothing to do with racials/traits etc, or lore, NOW, its just misinformation or old information that hasnt been cleared out when it comes on "searching".
This is what i noticed with multiple people starting WoW the latest years, because of Greek net cafe culture,and the nature of my job to IT support for extra $$, i tend to meet pretty much hundreds of people over the years that play the same games as me at periods.
The slightly already more "Hardcore" gamers, like the people that play more seriously than others, follow/gravitate towards what they are told is better, or what the rest in the netcafe play that they know are "Better", or they do some basic research after asking and they passively gravitated towards what the rest were playing, aka horde.
So you have all these 18-22 year olds, getting interested in WoW (Not that many over the last 5 years or so, maybe 20-30)half are already something like League of Legends Platinum/Diamond/Challenger, etc, CS:GO higher ranks etc, Dota 5K mmr + etc, but of course we are talking about 5-10 people out of all the people starting that are interested, out of a generation of maybe 300 young adults, every 2-3 years.
Guess what the rest 10-20 people pick :> the girl gamers and their boyfriends, their friends, etc..The non-ugly races, aka Alliance.
You know how many times i heard in squeaky girl voice "Ewww why does it have 2 toes" or "Blood elf is so pretty, but the rest are so ugly".
Now you have those 5-10 players hardcore mentality, trying to play catch up in 1-2 months, asking, researching, addons, etc, trying to do M+15 as ~2 month old players, copying the better players around them, they dont learn everything, but their class and the basic things go up way fast, its in their nature.
And you have the rest, literally logging on a few hours every week, taking 20mins to do a quest that takes 45 seconds, alt tabbing into heartstone, and pretty much not giving a fuck about ever learning the game, they all gravitate towards Alliance, very very few go horde, and its usually because out of a company of friends of 5, the 5th is a bit lower skilled/doesnt care, but followed his friends.
I have seen this happen, for every generation 5-6 times now since WoTLK.