I think it is fair only if CPUs clear if R>0. If there is a situation (not due to a glitch) where RPUs will clear but CPUs won't then that is a significant change to the value of CPUs and I wouldn't find that particularly fair since all upgrade mechanisms have generally been described as equivalent - i.e., either an upgrade is available or it isn't but if it is then any published upgrade path can be used to acquire it. If this has changed then UA should publish that clearly and provide some transparency as to what the criteria for CPU clearing is.