Well yes, they do do that for one! LOL
But I spose I'd only test for interest really, because for a fatty meal, I do an extended bolus anyway so hope to avoid a spike, so if I was too high an hour later well I wouldn't normally correct at that stage because I'd be wanting to know when the high tailed off. If you interrupt an extended bolus to deliver a correction or further bolus, it cancels the first one. Or if I wasn't sure of the carbs and took a guess at it. Those are by no means every day occurrences though, are they?
Sometimes it may be necessary to correct but usually it's because I haven't taken enough upfront for that meal - ie user error.
I mean do other people set their parameters really tight? - eg 4.0 to 5.5 or wider eg 4.0 to 8.0 ?