It is my understanding that due to biological changes, in some people with Type 2 the body stops producing insulin, effectively changes the diabetes from Type 2 to Type 1.
It is also my understanding that with Type 1, for the most part, the issue remains the same: the body is not producing insulin, so it is needed from an external source. However, in Type 2, the issues fluctuates as time goes on: insulin sensitivity changes as well as insulin production.
For that matter, the body's needs change even in Type 1. My basal rates and ratios are different today than what I had 5 years ago.
Diabetes is dynamic, not static. Things change all the time. Hence the importance of always testing and making adjustments as needed.