People simply want to be where their faction is the dominant faction.
I personally prefer the factions to be as balanced as possible, but people still want a little advantage at the end of the day…
No one wants to be stuck in the server where the other faction controls all the World Bosses and World Events…
We have seen this in retail during the entirety of WoWs history… The “imbalance” discrepancies will only grow over time as long as paid or free transfers are offered.