There's a thing called "foot on floor", kind of like dawn phenomenon. If I wake at 5, I'll easily go up to 8, 9, 10, just by getting up and moving around, as my liver starts releasing glucose for the day ahead. So I pin it with a couple of units even though I generally don't eat till about noon.
That way, I'll be going into "brunch" at noon with a decent level instead of doing a correction for an out of range.
Some dsns are still tied to the idea of saving corrections till meals, but if I know I'm going out of range, it makes sense to correct there and then. Even without food, the correction dose is simply doing what it's meant to do - lower blood sugar by letting the excess glucose into cells to be used as energy.
Bg isn't stable in non-T1s. It just appears so, because the alpha and beta cells are nudging it up and down in response to changes throughout the day. There's no reason why we shouldn't either.
I can understand their caution, as strips give us limited vision on what's happening. But, now that cgm is starting to become more common, giving us a real time graph of what's going on, some hospitals are encouraging the use of "Sugar Surfing" techniques, the book by Stephen Ponder. It's the idea of looking at the cgm trace every so often, and then doing a 1 or 2 u, or 5g nudge when it's starting to go out of range. The book is recommended in the pdf linked at the foot of this page, run by Edinburgh hospitals:
http://www.edinburghdiabetes.com/cgms-1/
It's riskier without cgm but still do-able on strips.