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A concern was raised that we don't have any notes that PPPoE can cause throughput bottlenecks on appliances because of the fact that PPPoE is limited to a single queue for packet processing, which can have detrimental effects.

We have information here, but nothing explicitly stating that this issue is across all appliances:

https://docs.netgate.com/pfsense/en/latest/hardware/tune.html#pppoe-with-multi-queue-nics

Additionally, the workaround there only works for Intel NICs, but it is not mentioned. Applying that patch to ARM-based systems or non-Intel based NICs will not improve speeds.