Echo and Blessing of light, post endwalker retcon

[Theozilla]

I don't get why ppl are getting so much hung on Zenos, Fordola and Misija, we practically did the same thing with the talismans, they literally copied the aetherial ward, much the same way the resonator copied the echo powers

The talismans did not copy the Blessing of Light in the same way that the artificial-Echo users literally needed a natural Echo-user to copy/create for the artificial-Echo user.
The alchemists’ talismans are more like the Garlean radios, replicating a desired effect, not literal copying/transferring.

And there’s no reason to assume that the creation of the artificial Echo, also copies the Blessing of Light in the process, especially when the Blessing of Light has been shown to other properties in addition to the tempering protection (like the shielding from Ultima and/or general power boost it can provide be amplified by Crystals of Light).
And the WoL still had the Echo and tempering protection when Midgardsormr had suppressed the WoL’s Blessing of Light during Heavensward.

And the “power to dominate” spiel Zenos gives in Stormblood is indicative of how the Echo and Blessing of Light’s tempering protection differ in fiction as well.

the echo is like something all ancients had supposedly
yet the unsundered were still very much tempered

As stated previously, that likely has to with the Echo’s protection being derived from the “strength of will/power to dominate” quality that the Echo protection involves. Thus a Primal like Zodiark could feasibly overcome such a barrier due to its strength of will far surpassing any average primal.