The way my Dr explained it at first is that you (the patient) can futz the blood glucose number temporarily. The A1C will tell him how I am doing over a longer period of time—making longer term management more effective.
I still measure a couple of times a day because I need that constant metric to make sure I don’t slip off the wagon.
Whatever works to keep it down is what I favor.
Yes, the daily numbers can be futzed. The two tests are complementary, in fact. My most recent HbA1C is helping to correct an issue with over-medication using insulin (it’s a long story).
However, it appears to me that they didn’t catch enough people with their plasma glucose range shift a few years ago, so they’re introducing a new way to spread the net. This way, they also include the med labs (or test kit providers) in the bonanza, too.
Yes - I’m cynical about “latest medical science”. I remember the “egg/no egg” back and forth all too vividly not to be skeptical.