Its not that these aren't nice devs. They are truly. But......
But.... where are the quarterstaves? dwarven waraxes? greatswords? and why are we limited to only the bow being earth? the rapier air? the khopesh water? why not a bow of air? or water? why not a khopesh of earth? why not a greataxe of air?
Variety. People don't like to be pigeonholed. We don't like to be led. Limitations = aggravations. You had something working well with greensteel and the cannith alchemical weapons. Maybe we don't need daggers or hand axes or shortbows, but many would like an awesome epic dwarven axe, many would like a quarterstaff.