Lots of aircraft that doesn't work on
a change in power in an aircraft that has a moving stabiliser that sits inside the slipstream as a trim method will not hold the same speed. A large change in power will produce a large change in attitude that will almost certainly correspond to a large change in speed.
The pitch change is caused by a change in the lift moment created by the difference in pressure across the tail and the wings right? So if the trim method automatically compensates for power changes in the way that it does in the tomahawk, warrior, C152/C172 etc and TB series then that principle works (a relatively small trim tab that isn't that greatly affected by more airflow relative to the size of the tail, with the exception of the tommie which has an elevator that lives outside of the slip stream so only Airspeed initiates a change in trim). But in the case of the cub for instance it's the AoA of the entire stabiliser that changes so a change in power alters the lift balance between the wings and the tail in a larger way, it requires a different attitude towards trimming but it does still come down to the same basic principle that if you desire a certain RoD and Airspeed then you must set the power and attitude to achieve that and trim to maintain it without having to push and pull your way down
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Probably not a great explanation but I think that's what Pace is getting at.