One of the main uses of these technologies is precisely because some type 1 diabetics can become unaware of the symptoms over time either through chance adaption or over-exposure, for instance, hypo-unawareness.
Not only that, but the symptoms for hypoglycemia do change over your life, so that what is felt today (e.g. excessive sweating, blurred vision) may be totally different in the future (e.g. confusion, tingling thighs). Or you lose that sense of feeling entirely and never notice a problem until it's way too late to easily remedy.
