It seems to be common practise to treat type 2s with basal, if they NEED insulin. Although I too need a bolus occasionally which could be when my c-peptide result is in the 700s. Lately in 1000+ I feel is because I've allowed my liver free reign. No early intervention from liver dumps.
The liver processes sugars and fats. Good fats are the livers best friend but sugars aren't. Well for type2s.
So if you need a long lasting backbone of insulin (basal) make sure it's with metformin or natural blocks from your liver dumping throughout the day, and night.
Insulin resistance is worst at breakfast time. Why? Because the liver, if impeded, it can slow your whole digestive process and intail your whole metabolism. Many of us eat some sort of breakfast. Or should. But many find fasting can restart their metabolism too.
Basal insulin is helping me and no I haven't given up on Metformin as my saving grace but it just wasn't enough and with horrendous side effects on my most common measure over 20+ yrs. I've been forced to reduce it once again but now finding it's most likely from sludge in gallbladder neck. So once pain and gallbladder no more in the future I will concentrate more on my liver's needs to stay healthy. A healthier metabolism.