i think it a good idea but should still have deflection adjustment to compensate for belt wear.
kinda a turn off for me until it is proven. the moveable sheave riding in on a bearing, it better be one hell of a bearing.
It "auto" adjusts as the belt wears. So it always stays tight as the belt wears. No need for for manual adjuster. I think it's a great idea but get some of the concerns. 4s are using this year so we should now if there is issues.