First off I didn't bother reading this tutorial thingy....
As a person coming from the live side of this business, tuning P.A.s and dealing with feedback at monitor world for well over 2 decades, hunting down frequency issues was a way of life.
Now that I'm mastering, my past sure comes in handy.
This whole thing about using or not using a analyzer of any sort (or any other tool for that matter) as me shaking my head. For most situation I can easily make decisions without any tools whatsoever, YET there are times when I find it quite helpful to open up my FFT.
I find it a great tool. A great compliment to my arsenal. My mind was trained in a 3rd octave world, but as we all know, that isn't nearly as precise as we can and should be in certain mastering situation. When I know a problem is between two frequencies (let's say 6.3 and 8K), I find my FFT useful, help me hunt down something that maybe at 7.67K.
Of course, ultimately, our decisions have to made with our ears, using our experience for the given situation. Not by what we see on our tool (notice I said see).
I guess what I'm trying to say, is that I while I applaud those with enuff experience that are quite content to rely on their ears alone, when used properly a tool is a tool. And as proven time and time again, it's never about the tool, but how we use them.
One last thing, obviously, 3rd octave tools are way to coarse to be truly helpful.
Oldfart