I have never met a Type 1 diabetic who's managed to do it. They usually get it when they are younger, and so they have a lot more time to develop complications. I do not know about Type 2s
I was Type 1 and had almost all the complications except neuropathy and GI issues. (I had a kidney/pancreas transplant in 2005, and no longer need treatment for diabetes)
It might be easier if someone's diagnosed with it now, but I was diagnosed in 1971 and there was no such thing as blood sugar testing then and no insulin pumps either.
Plus there is a theory that no matter what you do, Type 1s may be predisposed to certain complications, and it differs according to the individual. And it's impossible to mimic the exact function of a working pancreas.
It would be great if someone with Type 1 for more than 20 years responded and said they have no complications, and explained what they did.