You seem to have missed where I saidIsaac wrote:If you don't have either... then petrification becomes a serious problem. If a party member gets crippled ~then petrified, the entire party can potentially become permanently immobile. Even without that, the party could permanently lose members over the course of the game... potentially meaning that the player could face boss fights with as little as one "surviving" character.Anurias wrote:The crystals and potions don't make the game possible, they make the game more forgiving.
plainly put, it is possible to play through the game without letting any of your characters die or become petrified. Having things to counter those are just the devs giving you something that allows you 'to be forgiven' for having that happen to a character. It is by no means a requirement for them to put that into the game. It makes the game more forgiving. You can get a character killed or petrified and fix that problem with a crystal, but just because you can fix it doesn't mean you have to need to be in a situation where there's anything to fix in the first place.The game 'can' be played without crystals and without potions
If the devs scripted something into the game where you were presented with a puzzle where you were required to kill one or more of your characters to solve a puzzle and progress then yes, you would have to have some way to bring them back like a crystal or potion. However, you are not presented with any situations in the game that require you to be in a situation where using a crystal or potion are necessary to continue through the game.