A:Anyone not absolutely fucking retarded would be using godrick's greatrune and a soreseal, bringing you to 20 from the baseline of 10. Because
B: All the other great runes are utter dogshit, especially Malenias, which is like vampirism in the same way that sewage is like soup, and the soreseal is way better than anything else at level 1.
C: The opaline tear is obviously the reason you can take two hits at baseline health to begin with. If you're getting hit more than that in the fight you're getting fucked over too badly to heal anyways and your health is irrelevant. Again, this is nowhere close to something like the capes you get in Monster Hunter, which let you take multiple attacks without suffering damage, and can be used more than once per fight. The benefits you gain in ER by exploring and grinding over a speedrunner with a fucking club and like 4 items are pretty much negligible, because it's a shitty action game with a thin veneer of exploration and RPG mechanics that don't actually matter. It's not remotely comparable to the other games I mentioned, where the difference between two characters is massive.
If the stats in ER actually mattered, you wouldn't have herds of retards extolling how incredibly useful 5% more health is in a game where you die in 3 hits.