There was a thread on the book Crucifixion in Antiquity at the time it was published : Jesus-did-not-die-on-the-cross-Gunnar-Samuelsson
I remember that thread, Leo was in fine form in that one, like she usually is.
I think the issue here SEEMS to be one of idoltary and that it is improper to use the symbol of the cross in worshipping Jesus.
While for JW's the issue is clear, since they do NOT worship Jesus at all, it seems less clear for other denominations.
Probably why outside of the JW's no one cares that much about the shape of the Cross.
What I do think is a prime issue however, is the JW view that the cross should be viewe dupon with disdain or with negative feelings/conotions and I say this because that goes directly against what the Apostle Paul said:
Galatians 6:14 he says:But may it never be that I should boast, except in the cross of our Lord Jesus Christ, through which the world has been crucified to me, and I to the world.