I've noticed that in many areas, if you can sneak past, you don't have to engage and use bullets or risk health.
Have you or do you plan to:
Play on survival, but kill everyone instead of sneaking past ?
This is what I've done for my third and fourth playthrough both, the third on Survivor+. It's the best way to play the game. I like to clear areas out for that completion feel, and so that I can explore them fully. The only exception I've made to this is infected Tunnel right before St. Marys. Killing off three Bloaters while scampering away from numerous Clickers and Runners just isn't worth the effort, not when they can be snuck around so easily.