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I don't know how 'only authentication' from PPPoE would work... If you do PPPoE auth, then you can DHCP? That would be a pretty weird config to setup.

I know some CenturyLink fiber defaults to PPPoE, but you can ask for IPoE instead.

I have Quantum and a UCG fiber. IIRC you only have to turn off vlan tagging on the ONT, and then set DHCP and the vlan tag on the UCG. If you try to keep the vlan tag on ONT you will get horrendous latency. The ISP still shows as CenturyLink.

You're right about Quantum. I just went and checked my router config. (I switched from CL to Q about 6 months ago).

CenturyLink did use a full PPPoE stack though.

To muddy the water further, AT&T just bought Quantum fiber.

FWIW, I have Quantum fiber (from post-CenturyLink but Pre-AT&T vintage) and it uses PPPoE.