We agree that having my or any other name above comments adds nothing of value

No, we do not agree on that. There is immense value in knowing that comment 1 and comment 2 were posted by different people, and that comment 1 and comment 3 were posted by the same person.

What doesn't matter is what the authors' identifiers are. AnonymousCoward42 and AnonymousCoward666 (etc.) would be fine! except that they lack mnemonic value.

The goal would be having nodes attributed to AM and disconnecting them from a single account

Why is that the goal? (I assume you're speaking only for yourself here.) I don't see that as a desirable goal.

concern for their online footprint

Can you elaborate on that? It's not intuitively obvious what the real concern is, or why.

FYI... We had one rather high-profile user who requested to be anonymized, now known as anonymized user 468275.