ATMA nerfing - An addressal to those who object to it.

[Taliph]

Simply put, the argument you state falls under the logical fallacy portion of that article, read it and you will see how it applies.

Btw, myth tomes will likely be phased out, just like philo tomes were, in the upcoming patch.

Edit to add: a proper and non-fallacious use of slippery slope would be to surmise from previous nerfs to old content that the atma(and all other content you mention) will likely be nerfed in the near future as part of the games design philosophy. So all the detractors thankfully are wasting their breath.