The only argument that I see is the ladle pour only casters are not willing to accept that some bottom pour casters can produce equal bullets. I cast for and shoot BPCR out to 1,000 yards using both methods. I am a toolmaker by trade and I understand precision inspection better than most.
I never have nor will I be able to run a 4 minute mile but I do acknowledge that others can. Why is it so hard for some to acknowledge that good technique equals good bullets with both methods?