The BIGGEST problem here and at other places IMO is Muppet pilots reporting where they are when you can see them next/ahead of you and are most definitely not. Why do it ? is it just being slack ? stupid and dangerous
Some of the smaller airfields / farm strips may have areas where you cannot see the whole circuit when you're on the ground. At the airfield I fly from, a couple of the runway hold points has trees on the opposite side of the runway which block your view of parts of th ecircuit.
I can think of another airfield locally which has a similar problem - a line of trees block your view of any traffic on final if you are departing to the west.
So some of us that are positioned where we can't see the whole picture can still build it up from the radio traffic? I would suggest it's not being a muppet, more sound common sense.