I’m not sure what information w/kg would provide other than suggesting some kind of artificial “enhancement” is occurring. I believe ave watts would be a better measure, and would provide better information. This is especially true on flatter courses like Richmond. Many Zwifters seem fixated on w/kg, and need to remember on a flat road/course power to weight is irrelevant. Absolute power is what counts. Power to weight is only relevant on climbs, particularly long climbs, and not the short/punchy, kind found in Zwift. W/kg would be Ok for KOM, but ave watts for sprint and lap would be better.
Bottom line is I like the idea…just a different measure.