Doesn’t something that big/expensive/complex have appropriate analytical sensors?
not ones that can withstand being ground against stone.
I don't know that it would right on the cutting head, right there at the work...But of course it may...It certainly would have sensors measuring the load on the motor...Never seen one up close but no doubt a very complex piece of machinery...
It's probably in pretty deep and they don't want to or can't back it up very easily to have a look see...
I work on machinery (recently retired) and am always excited to see how machinery works...