^
the potion/drug thingie is a huge trademark for a witcher: these potions would be overkill for a normal human. and the monsters in the books literally require Geralt to use the potions.
SO they should not be optionable but required.
This is a great tool to deliver another tactical dimension.
I am still not quite sold on the new potion system, though. I, as a gamer, normally tend to have these hoarding symptoms if the game is too easy. A lot depends on the frame conditions of the system (how difficult will it be to upgrade/refill, how powerful will those upgrades be, how necessary are the potions...)
Sounds like a cool new approach and a possible characteristic trait