Ok, who does it. Who welds right on the machine?

When I was first learning to setup and run my first CNC mill (a Taig 2019) I
sometimes repaired a bad cut in aluminum right on the table by filling it in
and then milling it flat. (DC spool gun) Often without shutting down the
mill. I don't recall any immediate catastrophic failures, but I sometimes
wonder if I was just lucky.

I have never done that on any of my other machines.