Eh, let people enjoy their games how they wanna enjoy their games honestly. If some people just wanna have a casual fun time, nothing wrong with that. If you wanna make the game way harder by using want of hardship, nothing wrong with that either. I only really found the final boss difficult and I haven't used a single consumable on normal mode so I'm with you on the note that this game is not really all that hard, but again, people are free to enjoy things the way they enjoy them.
Some boss are hard depending how you approach them. Example with cemetery boss, if you play tactical it's really complicated to defeat, on the other hand if you rush straight on him in no-brain mode you defeat it in 10 seconds before he can even invoke zombies.
Most of the game is more die and retry than really skilled based, also the experience depends a lot how you are set up. For me again, my gamepad isn't recognized and hammering my keyboard each time my character is grabbed isn't something I enjoy at all, nor something a keyboard is made for.
So yes thank you for making it clear to let people enjoy the game as they wish, when I see some aggressive child claiming the game is easy while they say they are playing on casual and miss completely the point of some people complains, like I said I don't mind having to restart a boss, I'm more annoyed to have to see the same scene again and again you can't skip on defeat.
But I guess narrow minded people are the norm now.