Well, I'm really quite old and have been playing for over 50, professionally, but I have added the Chico finger to my techniques, both for flamenco rasqueados and for classical chords and arpeggios. The Bach C Major Prelude from the WTC sounds awesome with all 5 RH digits employed. Changing one's hand position is, by the way, a GOOD thing to do, most of us should have more than one anyway. Practicing with the pinky also rebalances the hand in a cool way. In the jazz world, players using a pick develop a "hybrid" technique using the pick and the m,a and c fingers for chords and arpeggios. As far as strengthening goes, it's a actually stronger than the a finger and more mobile, having its very own tendon set instead of having to share with m, as a does. Anyway, it's available, and as an engineer, Postlewaite knows that using 100% of a device is generally a little better than using 80%. Should we abandon the little finger on the left hand?
Lester Devoe Flamenco Negra
Lester Devoe Flamenco Blanca
Aparicio Flamenco Blanca with RMC pickup
Bartolex 7-string with RMC pickup
Giannini 7-string with Shadow pickup
Sal Pace 7-string archtop