I’ve found the opposite to be true. When I've taught mastering workshops, I’d build a chain & show people what each thing does, etc in great details. Basically, show the attendees what we ME's do when working, addressing particular areas, and how they can utilize the tools avail.
You know what’d happen afterward? I’d get a ton of emails/requests from people who attended asking me to master their tracks, as they realized that while they had my chain settings written down, they were missing the know-how that’s specific to X or Y situation.
And that's the crux of the thing, it’s not the tools or the info you can find on YouTube (anyone can do that); it’s the hours & hours of doing the job over & over again, knowing when to touch an EQ knob, a compressor, etc & knowing when to not move anything.
But more importantly, having a vantage point & separation from the work to see it in a different light, without being emotionally attached to it whenever a decision needs to be made. It's about listening objectively and with intent.