Great idea and like most things imo its continued success in being widely accepted may in part depend on everyones adherence to agreed installation conformity.
I do not know if this is already the case or even if such a thing already exsists but Im just thinking out aloud as I want this to succeed and benefit millions of others
Without conformotity
Poor choice/use/application of material when making good around the finished job may affect its long term ability to remain flush with the surrounding surface.
Being flush to the footpath and remaining so is its safe selling point and thats something that can easily be lost
For instance/example only
A sub-contractors use of mortar to marry to Tarmac imo should be avoided
In a nutshell imo when fitting these things best to do them all in a proper agreed and conformed manner