Is it a good idea to trimm roots periodically?

im using a hydro/DNW sys and was wondering if its a good thing to trimm the roots from time to time?
thnx

From what I read in Marijuana Horticulture: The Indoor/Outdoor Medical Grower's Bible By Jorge Cervantes, the roots should not be trimmed. This stunts the plants development. If your roots get big enough to trim, it's time to repot.

only if its a mother plant

Don't cut the roots