As far as I know, this is a debate it not settled in endo. GLP1 seems not to imrpove outcomes for t1dm (although I dont think this is 100% settled yet), but there is an increasing population of Type 1s who also have several risk factors for type 2 and/or have signs of insulin resistance.

I dont know any study that focused on the benefits for those populations, but I believe there is hope that it mught prove useful. Hope, of course being a terribly unscientific basis for the use of anything.

Take all that with a grain of salt as I am not an endo, just a t1dm who has been getting fatter and fatter, probably for the same reasons I havent had the time to get up to speed on the developments.