> the relevant scale and arpeggio patterns, etc,

That phrase is smuggling in a LOT of work that systems like CAGED help to simplify. I say this as someone who has played guitar for decades and slept on CAGED for too long.

100% agree. CAGED is extremely underrated. The starting premise is so simple, that most intermediate players go "yeah, yeah, sure...that's cool but it's not very insightful". It's when you start hanging all the basic (and probably more) scale/arpeggio patterns off it that it starts to become more and more valuable.