This is the part I’m not sure about and would like to see some testing. My understanding is this shouldn’t change the rolling resistance with the same tire and width. For mtn biking it’s more the angle of attack for rough terrain, so I’m skeptical this reason transfers over to road/gravel. Add it the extra weight of the wheels and tires, increased ride height, and possibly worse handling, and I’m even more skeptical.
Looking foreword to seeing some test results on this for sure!