Definitely not. I used it for 27 years (a drop in the hat compared to some around here.) Personally, I think it’s best suited to those with gastroparesis, or any other condition which makes you digest especially slow. You’ll often see the R method (usually mixed with slower acting NPH) described as the “eat now or die” regiment. It is very slow to start acting, but hits hard when it does. You must dose well in advance, and then be ready to eat the moment your insulin starts dropping your sugar. If you don’t eat at that exact moment, you will plummet like a rock. This is why we did “carbohydrate exchanges” when that was the only insulin available. You had to learn to eat the exact amount of carbs your insulin dose demanded. And those doses were usually generalized, not specific to your desires or food needs. You ate to whatever dose you were assigned (plus we were given a sliding scale to adjust high blood sugars), rather than the modern technique of dosing for your meal.
That’s not to say R isn’t still a viable insulin choice. I used it up until three years ago because I couldn’t afford the terribly expensive analog insulin. I was in the weird middle ground where I made too much money to qualify for any assistance, but still couldn’t afford the insurance premiums, let alone the healthcare expenses on top of it. It is definitely a more dangerous means of controlling your diabetes, though. You’ll see comments all over this site about “surviving” the R days, but almost nothing about thriving then. Personally, I NEVER ONCE had an A1c below an 11 until I switched to analog insulin.
You have some significant advantage over those of us who used it before CGMs or FGMs were available, though. Also, my perspective is from Type 1. I’m not sure what you are, but if you’re still making your own insulin and only need a little help, that too might minimize the disadvantages.