I know myself if my first encounter with a grower/vendor is not a positive one, I probably won't order from them again. That's just me. I will also say some peony rootstock can be smaller but still be able to produce flowers. Genetics have some play here. Most disappointing to me are moldy or dried up arrivals😕. Time and growth will fix a smaller healthy root, but the other two can inevitably effect growth and survival.
Also I got Pink Cotton Candy last year from Fina. It was a healthy but smaller root as compared to the others I received in the same order. The number of eyes was fine the root itself just appeared smaller.