i think alot of us learned the a minor pentatonic
scale at the 5th fret first
(not everyone, but alot)
there are other scale "shapes" that happen at the
different posititions (you all covered this earlier)
but they all link together and are all the same 5 notes
...
anyway...
i think your question is "why would we want to
use the different scale shapes"
for me...it was hard to "break out of the box"
hard to break away from these "vertical" shapes
and i stayed in one position up and down and down and up..
bending and sliding..
once i "broke out of the box" by connecting these....
i went crazy and solo'd like a mad man from the 80's
(so i thought)
but then i slowed down...and just played some slinky
sliding riffs based on this scale...and went more
"horizontal" in my riffing.
you can get some really laid back tones by playing
the same notes...but up on the lower strings up around the 10th fret for example...will sound much different than
playing the same notes at the higher strings near the nut.
so for me...the answer is just play around all over the neck and listen to the different tones...and the
differences in the "warmth" of the notes...
good luck
hope i made some sense
:)
-G
yo