That's illogical though, because the plethora of choices in previous talent systems did nothing to stop cookie cutter builds.
One thing that hasn't been mentioned which might affect the end result is how easily you can 'respec' your talents - it's supposed to be something you can do in the field in a few seconds. The only purpose for class trainers is to change your spec. There will always be a talent that's mathematically superior to another for a given situation, that's just how math works - but with the ability to change your talent choices on the fly, it gives them more flexibility to design fights where you'll have to in order to get maximum utility.
Just to pick an example completely at random, the first-tier Mage talents: Ring of Frost (much as it is now), Ice Ward (defensive triggered freeze Aoe), or Frostbite (ranged Silence/Freeze). In a PvE raid fight, whether Ring of Frost or Frostbite is superior depends on the mechanics; are there adds to be controlled, or does the boss have a dangerous interruptable attack to silence? One tier down, Blazing Speed could be crucial for a fight heavy on snares/stuns, moreso than Ice Barrier's consistent absorption for fights you can stand in place on.
TLDr: Yes, there will be 'cookie cutter' builds - but Blizzard is giving us the tools to bring our cookie stencils with us to the raid, making talents far more dynamic then they've ever been in the history of the game.