Dalrymple explains on Pajamas Media why a new insulin pump, which seems to control blood sugar better, may or may not be as helpful as hoped:

It seems to stand to reason that if the complications of such diabetes are caused by poor control of the level of blood sugar, and if the new pump assists in producing better control of that level, then it ought to help in reducing the level of those complications. However, this type of reasoning is always hazardous in medicine: the proof of the pudding is always in the eating. It is all too easy to treat biochemistry rather than patients. The better control of blood sugar levels is not an end in itself. It is worthwhile only if it actually leads to clinical benefit, and that has yet to be shown, and this will take a long time.