I can’t post the entire Document, because I just cant. However these are the examples used when VS would be more applicable over other modes.
Examples:
PRE078 climb FL 370 at 1000 feet per minute or greater until passing FL 360 due crossing traffic.
EKR365 descend FL 120 at 1500 feet per minute or less.
SNA031 descent at 2500 feet per minute or greater due traffic.
SLV015 climb at 1500 feet per minute or greater until passing FL 220 due danger area ahead.
Rather than acting like a know it all, as a Pilot on a flightsim forum, why dont you educate in a manner that teaches rather than acting all high and mighty. I am not disagreeing with you, as I have said it could be a factor of many things.,. But this is the info given.