[andyfleming]

If the islet cells persist then it's effectively cured. If new cells have to be injected regularly it's still likely to be a very effective treatment.

[spacedcowboy]

Perhaps, but generally we hope the cure to be better than the affliction. Type 1 is fairly easily managed with insulin pumps and CGM for a closed loop system that almost approximates a functional pancreas.

Taking immuno-suppressants, which often have painful or nauseous side-effects, as well as the elevated health risks of reducing your immune system doesn’t sound like it’s an actual improvement - at least IMHO.