This fails to answer the biggest question.
For most T1D is not about not producing insulin. That is a symptom. Not the desease.
Its a genetic vondition where the immune system attacks insulin producing cells. Pancras transplants have existed since the 90s. In most cases the patients become t1d again the future.
As t1ds have already done this to there own insulin producing cells. How dose adding our own stem cells help long term?