The problem is that Nordland and the Cult of Sigmar uses this controversial point regarding Hekarti to score political points by complicating the process for building new Waystones. They have lots of influence and reach over institutions in the Empire, putting up obstacles is well within their ballpark.
It's not the direct impact of Hekarti markings but rather the perception and sensitive political situation surrounding Laurelorn, putting Hekarti front and center in the final product will hamper its appeal to otherwise interested parties.
That is such a weak excuse that you could use literally anything in its place. 'They put the markings of an elf god of magic on the magic elf stones and if you look carefully the magic elf stones from four thousand years ago did not need that so these clearly do not'.
Mathilde *deadpan*: I will get right back to the Golden Age mages with the complaint.