Me thinks you are confusing theory mumbo-jumbo with model sub real world operation.
In theory you are correct. But even though the model is moving up or down at times it will appear to be at a set point and hovering.
I know it is not actually hovering and is in real life decending at a slow rate, but it seems like a hover.
I think you are trying to read more into it than it is.
As they say(who ever they are)it is what is is.
It is just a proportional controlled piston tank.
You are still controlling the depth with "guestimation". It just makes it a little easier. BD.
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