My great lesson is that these actions must not be dismissed. The Edwin Brown action system is from 1843. Erard’s is from 1821. So, it might be considered that the “old antique” Brown action is some 22 years younger than Erard’s system - our default action of today. I strongly suspect that Mr. Brown knew, full well, the Erard system, and his creation was an attempt at some sort of improvement and advancement.

The videos below are from Hampshire Piano (shared with permission) and demonstrate the two different action systems.