You're misunderstanding...
what you described refers only to the inner deadzones (to avoid drift), however the outer deadzones are designed to get you to the pegged state (fast turn) sooner - allowing you to peg without quite as much thumb movement / effort.
hence why some people might really enjoy having a generous outer deadzone.
not sure if I explained any of that any better - but does that makes any more sense?
my fingers are messed from years of piano, cooking, and home renovations - so I've been on a 0 inner, and bigger outer deadzone and my tendons have been much happier.