The strongest build each season has many times been eaither due to a bug or something blizzard overlooked and with more abilities, more items, followers? Dont put all you’r eggs in one basket.
PTR builds are not as relevant eaither so my bet is that spiritborn might be stronger early game but sooner or later some random class, because of some random overlooked combination, is gonna be insanely op.
Sure, that means Spiritborn could be the one that becomes insanely op but not because of Blizzard’s will to make it op.