Was riding close to C Obermeyer for a while today and paid close attention to WPKg for both of us. On the uphill, I kept the same wpk or slightly higher to keep pace with him. On the downhill, he was able to easily gap me using less than 2 wpk. I use a Computrainer which has built-in electronic inertia. I think most riders must be using a power meter and a fluid trainer. That instant rapid acceleration after cresting a hill must be common phenomenon with trainers that can not simulate inertia.
Would love for Zwift to provide a designation next to the rider's name as to what equipment they are using rather than the generic lightning bolt. I may consider recording the screen while I ride and post it on YOutube.