I completely agree with you that a professional musician must read notes. The faster, the better, but
I had a different angle on that book.
How often do you find the "64th note triplets in changing meters" during your gigs?
Just how often do you encounter the 64th notes?
Have you ever encountered the 64th notes while doing a gig?
Have you tried to play those 64th note triplets at 100 bpm?/at 90 bpm?
If so, how were you able to articulate them?
How did those notes sound?
I've found some excerpts from THE Jaco Pastorius
http://www.scribd.com/doc/29392880/Jaco-Pastorius-Modern-Electric-Bass
and
THE Stanley Clark solos.
To my regret, the 32th's were the smallest notes.
You might not need to play 64th notes at any point, but if you can listen to a 50/60 bpm metronome and play those 64th notes in time, that's great subdividing practice. It will help your ability to keep time in general and make you a more solid player rhythmically.