AMF You say "Following an R/A will not "likely" require and climb or descent....executing one requires a climb or descent every time."
Not necessarily - Preventive RA's such as "Monitor Vertical Speed", or "Maintain Vertical Speed, Maintain" (as opposed to Corrective RA's), are "resolution advisories that advise the pilot to avoid certain deviations from the current vertical rate but do not require any change to be made to that rate"
So if level, this would not require a climb or descent.