Agree. I was in the garage while cutting out something on the long mill, the plywood was a touch bent so the clamps had a little tension holding it down. the tabs on the one piece were not strong enough and the piece came loose - I heard it and was able to walk over and pause the machine long enough to remove the piece before something bad happened.
That being said I have set up a v carve and wandered off to let it carve - I was pretty confident it would work alright and checked on it every 15-30 minutes to make sure it was good. was working on a big piece of well secured MDF, and generally trust the machine to do a carve with no drama.
I also do a quick pre-flight check of the acme rods and retaining screws, etc to make sure nothing is loose.