If you're never going to try to handle Health any way other than the way you like, then it's bound to be not a very interesting mechanic. I'm just pointing out that there are other ways to do it. Now, you can expect that to be worse on the whole or not, but if you never consider alternatives at all, then every game is going to be simple - even Chess.
Analogously, CivBE's military game is extremely simple if you only ever make melee units. It's not inherently simple. You're choosing to simplify it.