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yes and YES and also to prevent new sgr's. Bob, of course I'm biased toward the new info (Buy the Book!), but anytime I see a U "fact sheet", just like every time I hear anecdotal experience, I look for independent corroboration. Universities like groups of practitioners can be echo chambers...

the best vids on root pruning are #11 and #13. John's a pro who gets to the root cause of tree problems, and prunes them out. The OSU "fact" sheet is 17 years old, and i know the author would not say all that today. the attached book chapter from 2007 was heavily peer-reviewed.