I have also herd this being mentioned this week.
I think this will cause all sorts of problems if implemented. On the job we are on at the moment, the main contractors are doing the chopping out. Unfortunately, they have let a labourer loose with a rotary stop drill and chisel bit and, as we predicted at the start of the job, it is a mess. They are not level or at the correct or same heights and even the chases are wrong, out of zones, too narrow for capping and too deep. a few have gone straight through the wall. We may as well have done it ourselves in the first place. █