Comments by "Dr. Ian Plect" (@Dr.IanPlect) on "Engineering Explained" channel.

Yes, thoughts! - they only increased the rear spring rates in line with the additional weight - therefore, it wasn't 'retuned the suspension on the RF (regardless of trim) to eliminate some of that body lean and tossability that the soft top exhibits' - the overall wallowyness remains the same and was also deliberate; Mazda wanted the sensation of knowing you were pushing on etc.
2