The name comes from two things that have been consistently true across every IT role I have held.
The first is that technology environments are layered. Every system you inherit has decisions baked into it that made sense at the time. Every network has a history. Every identity platform has been patched, extended, and worked around until it barely resembles what was originally installed. Understanding what is actually there, and why it got that way, is usually more important than whatever the vendor roadmap says you should do next.
The second is that the decisions that matter most in IT rarely have a clean answer. They live in the grey. The right platform depends on the team you have, not the one the analyst report assumes you have. The right time to replace a system is almost never when the vendor tells you it is. The right amount of process for a 200-person company is not what is written in any framework document, however well-intentioned.
Most of the consequential calls in technology are judgment calls. They require someone who has been in the room when similar decisions went well and when they did not, who can read the business context alongside the technical one, and who is not trying to sell you the answer that happens to suit their next engagement.
Layered Grey is a name that tries to be honest about that. The work is complex because the environments are complex. The advice is nuanced because the right answer usually is.