I would love, if nothing else with consumables, to see a change to potions. Maybe not the exact suggestions you offered, but something. Right now potions are so ineffective that they might as well not be in the game. Which I think is a shame, because potions are classically a very important mechanic in RPG and FF, but also because Alchemist is a craft now without a purpose.
It seems like they only exist to make mats for other crafts or as the misc craft, where oddball items that don't fit elsewhere go. But if consumables were given more importance, I think the craft would amount to something again.