To be fair so can Blood elves, but it’s explained that they “bend” the Light to their will rather than the “Traditional” method of using the Light, I don’t think Paladins/Priests are necessarily “suffused” with the Light, it’s more like they have a deep connection to it naturally that allows them to easily channel it externally, we usually see Light-forging/infusion as being a step beyond the typical “priesthood”/Paladin position.