All those are meaningless if the game tells you to exploit the system, put on heavy armor and the biggest stick you can find and go crazy on the zombies with invincible mode.
Please, there's very few games out there that aren't this. Jagged Alliance, X-Com, Fallout .etc are all cake walks once you learn to game the system, be it armor, stick, or a combination of both.
At least Dead State relies to some extent on randomized loot -- you won't always find the preferred type of armor every playthrough, in the same location. Nor do they grant invincibility; I've lost plenty of survivors, over the 50 hours i've played, to zombies (or humans) getting past the armor, since often there's no choice but to alert the enemies of your presence directly, if LOS doesn't permit sneaking. Should they get more hits in? Definitely, but you and your companions are not invincible.