Can't heal myself?

[League]

Attuning yourself with a doll would be like putting yourself in your own hands (fully, that is). It's sort of like why we can't really see our eyes with our eyes (directly, that is). It's why doctors can't really perform surgery on themselves. Aside from that, it'd be a) too easy, b) too helpful (with other weapons and all), c) knda weird.

Since they don't want us healing ourselves essentially for free (tonics being low-cost though and somewhat convenient and replace-able), they make it a skill that others make accessible. For one, it makes it a benefit to have a crew and friends, sort of like how giving to charity is a tax benefit made to encourage, well, having giving to charity.

All that being said, the poster above is right: get your doll high enough, and everything I said is thrown out of the window (though you still can't heal yourself: you need a victim of sorts, just like that doctor couldn't perform while knocked out).