that in an RMS sense… it is mostly Class-A.
I think you mean in an **average** sense. RMS has to do with how we measure a wave: peak, average, or "area under the curve" (root mean square or RMS). It is quite different. For a sine wave RMS = average. For complex waveforms you need to integrate to get the area. Eek! calculus!
But your point, if i infer right, remains valid.