Bloodletting + Leech allows you to survive and instantly recover from any hits that don't instantly kill you.
If you seriously don't think that's OP you haven't tried it.
Agree. I get the point of interesting tactics and discovery but that or healing from taking an arrow, it's just weird. If that is what they are after great, but to me my guess is they want experiment in a somewhat logical/non-game breaking way. We could then say "so many other things suck" because they are drab in what they do and the creativity you can use with them.