Yes, I have lived with relatives with diabetes and understand that it's quite complex. I don't think anyone with diabetes would suggest that it should be ok to just start taking insulin without a doctor involved, which is (to my understanding) the basic argument for whether a drug should require a prescription or not. You can make a separate argument about whether it should be a longer prescription, or about the failings of a system where seeing a doctor at all is prohibitive for some people, or the fact that the medication is outrageously expensive (which is not directly related to the need for a prescription at all).