Pricking your finger for blood is one of the worst things about having diabetes. It hurts, it's messy, and you have to maintain and carry around a glucometer.
it's tremendously important for type 1 diabetes, in which the body does not make enough insulin. The therapy for type 1 is insulin injections, and they can cause low blood sugar. So you have to check the glucose multiple times a day, or have a continuous glucose monitor.
But for type 2 diabetes, it's actually not as important. The American Academy of Family Physicians, through the Choosing Wisely campaign, says that if you have type 2 diabetes, and you're not on insulin or another medicine that can cause low blood sugar (like glipizide), you don't need to check the fingersticks. Instead, you can just get your Hemoglobin A1c levels checked through regular blood draws. There are a few exceptions, such as if you're changing your diet and exercise routines.
A number of trials back up this position. But interestingly, in one of them, being randomized to use a glucometer was associated with higher depression scores. So there is a bit of evidence that checking fingersticks in this situation can do more harm than good. This is another example of how more health care may not be better.
Obviously, don't make any changes without consulting your doctor.