Well that's clearly not true. We can already see from the numbers, that most players clearly are picking covenants based on what performs best in raids and dungeons.
As an example, the vast majority of Rogue players are either Night Fae or Kyrian. And if you for some reason think that Rogues like to be fairies or ascended angle-creatures then you're absolutely delusional.
People are in general abusing the 99% vs 1% "argument" to create pictures of WoW which are clearly not true. WoW consists of many many different groups of players and most of them care about performance to some degree. The statistics clearly show this.