I have this jacket in XS and I was the one who said the sleeves ran short. I stand by that, although likely the sleeve length gets longer with larger sizes. FWIW, I'm just under 5'3" with a long torso and short arms; I do usually need the shorter armhole and sleeve length of petite sizes. If your closet has a mix of petite and regular sizes, and you wear a smaller size, I think you'll be happy with the sleeve length. If you always need petite sizes on top and wear a larger size, maybe the sleeves would still be too long.
I don't find the jacket very stiff and I plan to wear it as both an indoor (typing at my desk) and outdoor topper. I won't be layering a winter coat on top, as Angie likes to do, but I never do that with any of my jackets.