Major pentatonic scales are used a lot in folk music and Chinese music. They usually have a joyful feeling. They are also very good for solos and melodies played on the guitar.

Generally, us guitarists accept that playing these ... arpeggio/chord shapes and compare them to shape 3 of the major ...

You don't need to know many guitar scales to play guitar solos – but you do need to know this one. The minor pentatonic is good enough for players including Angus Young, Slash, Eric Clapton, Jack ...