No, it's not at all like that. Knife users will be perfectly capable of understanding what they're doing when they cut off their fingers, and assessing its impa

No, it's not at all like that. Knife users will be perfectly capable of understanding what they're doing when they cut off their fingers, and assessing its impact on them. They don't even need pages of warning text to explain this. That's not the case for smartphone (etc) users.