Interesting topic. What I noticed is that there are many lessons on Justin’s site that teach licks in the minor pentatonic scale. These should be considered little phrases that one can put together to improvise with the minor pentatonic over a blues progression (or other types of progression, I suppose).
However, I don’t see the analogous lessons on licks using the major scale, licks that would form the building blocks to improvise with the major scale. It seems like the improv over the major scale that Justin is teaching in the Major Scale Maestro (https://www.justinguitar.com/modules/major-scale-maestro-1) module is much more free-form, not relying on pre-learned licks, but just improvising using the notes in the scale as the building blocks.
I’d be curious to know the idea behind this difference in teaching improvisation with the minor pentatonic and the major scales. Any thoughts?