It's usually not my thing. Knitting both sleeves at the same time.
But, my mother does it and she has repeatedly mentioned how great it is. They are always exactly the same, and there is something so rewarding about when you are finished, you are completely finished. Okay then, I'll give it a try, again. So, away I knit. Bound both off. Wow, that does feel great. Then, I held one up to my arm.... about 10 inches too long. I kid you not. Both sleeves are about 10 inches too long. (Distractions galore around here.) Now, that is a reason to NOT knit both sleeves at the same time.
My yarn arrived for this sweater. Oh, how lovely. I am resisting the urge to cast on until I finish my slouchy cardigan. Cause just like the sleeves, I am good with just one at a time.