Broadly it's true that historically there was this idea for ethernet networks at least. It was always optional though. Even in that long obsolete rfc2464 it's described as the way to do SLAAC which was optional even in 1998.

This kind of thing doesn't normally count as violation of layering though. In protocol design its common to leverage identifiers from lower layers for addressing. For example many workings of the internet would be hard to imaging with the rule that you could not use IP addresses and ports in upper level protocols (like DNS, P2P protocols, etc)