What if the Devs added another "Clan" for each Race?

[Jandor]

your highlighting those words doesn't mean pureblooded Garleans have a small chance to manipulate aether. It means using Magitech they might be able to bypass their lack of ability with aetherial manipulation and maybe possibly give themselves something like the Echo or even the abilities of the Ascians. This doesn't mean a 1 in 10000000 chance of an Arcanist.

p.s. Putting my reply into spoilers, because duh, spoilers to shadowbringers content.

I don't understand how you've arrived at the conclusion that the passage is talking about Magitek. It specifically mentions inborn ability to manipulate the bodies aether.

Magitek isn't something you're born with. It also generally uses Ceruleum as fuel, rather than the bodies own aether.