Tbh I think people are
being overly harsh
Jcb have tried to create a machine to help with a problem that is world wide
Yes they are reinventing the wheel and all those components are available already attached to other machines but essentially they have created something from a parts bin so shouldn't have to sell many to cover the design cost
Let's not forget jcb have some truly innovative british designed products
Yes a designed from scratch machine would be better but it would cost more to develop
The biggest thing would be to use a vertical axis milling head rather than horizontal one would mean no having to trim the hole edges
Either a 50mm diameter head being moved on 2 axis to make a large hole like a cnc mill or a large say 24in head so just drop it pick up and move on
If you had a milling head and the sweater or vacuum attached to a track carriage and a tracked hot box tarmac dispenser mini paver type machine to follow and a roller the whole process could be a procession down the road and therefore as
@JD450A said it could be run under mobile works no permit required just rock up at a road and sort every pothole