Plus, without the extra defense she gets from Awakening in the first place the passive bonus would be considerably smaller on top of being conditional. Anyway, the passive isn't bad at all compared to what many characters get, it's just hard to quantify because it's effectively like having extra sustain--it conditionally increases Elva's longevity but in a manner that doesn't impact her peak effective health. It's yet another thing that encourages people to think of her as an off-tank/bulky dps rather than an adamantium doorstop--she's better at hanging in there and murdering trash/fast attackers with minimal support than she is at staying in on one hit knockout artists.