Tonality of professional approach? Really?
If an expert's genre is similar to your own, and you cannot get even close, then I can see maybe these things are OK - but let's be very honest. Even if the expert is wonderful, with wonderful gear and premises, you are NOT there, monitoring on far less good systems, through a compromised delivery process - AND, and this is critical, it is one-way. Real, effective education requires two way. "hang, on, what did you just do, what is that noise, how did that happen?" All those possibilities are missing. Fader prods in a multitrack can be invisible unless you are there. 2dB is usually invisible - but in the room, you can see how and when it changes - youtube and any video format cloud this.
I have always followed Alan Parsons, but watching videos does not show me how he does things. The words can be the most help, never in my experience, the audio. Some people will learn something, but it depends on what the thing you pay for actually does?