Marty was my first guitar teacher just when I started out. I remember the time when I knew nothing about scales and how Marty tought that to me. At the same time I wouldn’t say that he is exclusively good for beginners. I would point out some of his more advanced stuff like B.B. King box licks and extended 1st position of the minor pentatonic scale.
One thing I wish he had was a video about how to hold a pick correctly. I struggled with that for a long time. In fact, I actually decided to write a short post on that on my website: beginnerguitar.pro.
Long story short, it depends on many different factors like style of music, speed, wrist position ets.

I am new to guitar but had played Baritone in grades school thru high school in a small school with a band teacher who went on to Iowa State. So I wasn’t finding where notes were and started watching guitar/music theory and found several who headed me to learn my Pentatonic E minor scale before I have finished with chords. I wanted to know where notes are on fretboard.
I agree Steve Stone is not only well educated but knows his stuff. Sometimes wordy. But enough content to give any beginner a foundation. I didn’t see Theory until Beginner Lessons are finished on other sites and didn’t have access without paying and too new to pay.