Very educational and well-written explanation of the importance of turning eggs while incubating.
One thing I'll note too that the first week is most important, and the importance level goes down as the chick grows. It's still important to turn them though. We have no problems doing a 5-day lockdown as they are more mobile and won't get stuck during that last week. (We've had silkies hatch rarely on day 18, but many times on day 19).