His rationale was basically that enchantments don't have the design space that artifacts do, they already cross over too much on artifacts, and to do what an enchantment block would need would be to upend some of the basic fundamentals of magic that have existed since year dot.
My issue with that is that that is exactly what they did with artifacts. Enchantments are IN such a bad design space currently because Maro pushed artifacts into that area. Equipment and coloured artifacts in particular basically makes enchantments a pointless concept, and nowadays they seem too scared to actually take a risk and do something new with them. They pushed artifacts too far at the cost of enchantments, and seem completely unable to acknowledge the complete screw up they made by doing that in terms of flavour and card type.
(The argument he keeps presenting is that artifacts shouldn't do global effects, that should be what enchantments do - but they can't make that change because too many old cards work like that. Which is the biggest pile of crap ever, given that they have routinely redefined what colours and card types mean to this day, often completely contrary to what has gone before).
