Agreed, sort of. But why not create without the potentiality of sin, the "reformed" proponent argues it is for God's glory, the non-reformed argues it is for creation to have some degree of free will (not libertarian). Is this an accurate reflection of the divide?
This is it, IMO.
Ephesians 2 tells us why God ordained that evil be: "That in the ages to come he might show forth the exceeding riches of his grace in his kindness toward us in Christ Jesus..."
Romans 5:8 verifies this- "But God commendeth his love toward us in that while we were yet sinners Christ died for us."
God SHOWS his love----- How?
By LOVING SINNERS.
There is no showing of this kind of love without sin.