First, there was like one interview from a guy that only worked with 5E for a short time that even mentioned a modular system. Can we give the "broken promises" trope a rest?
Second, I don't want a death spiral. Healing works well enough the way it is. It's simple and easy to implement. Want some variety? Go from short rests being 15 minutes to being overnight. Enforce hit die recovery or not. Maximize healing potions and make drinking them a bonus action or make them as rare as hen's teeth and require a free hand and an object interaction to pull on.
There's plenty of options for the groups that want them even without official optional rules.
Second, I don't want a death spiral. Healing works well enough the way it is. It's simple and easy to implement. Want some variety? Go from short rests being 15 minutes to being overnight. Enforce hit die recovery or not. Maximize healing potions and make drinking them a bonus action or make them as rare as hen's teeth and require a free hand and an object interaction to pull on.
There's plenty of options for the groups that want them even without official optional rules.