I can only talk for nightmare/Insane settings.
There is no real gameplay without to cheese the ai with these settings. just because u are so gimped at the beginning u need to fight them from the distance but the actual weapons are not doing the job, i mean come on.. blunderbuss only? I know there is more to come and im happy about that. Meele only works with cheese Frames and or blocks u fast create.
But now to ur question.
First of all. What is the real goal ? What do we want to accomplish here ? Is it about how long a player should stay in stonage.
Or is it about how Kittet a player will be by day 7 day 14 ? I dont even know.
We cant realy talk about this until we get the zones and see how they want to balance it.
I think its OK as it is but we need something harder as ferals. They are just to weak at some point.
In this state of the game we realy have to wait for the zones and balance them. All talking about balancing guns/Zombies right now will be obsolete once Zones are in the game. + They wont rebalnce anything before that happens.
Noooooo Pls dont gimb my shotty again, i love her so much
Super hard ? not realy its kinda boring, thats the point i want to make. I want it to be more interesting. Not harder or more easy. It should be Fairly Hard On insane settings. But bulletsponges and no guns at all until day XX are not the solution for us here i think.
So what is the solution ? No F idea Realy.
The only thing i see is, We can make the endgame harder way harder then it is right now. So we wont feel like game over once u get a shotty.
If we cant make it any harder we have to talk about nerfing things like guns and so on but as i said its all obsolete already until Zones are in.
Edit
If we are talking about the zone balancing right now.
The best of the best items should be super hard to get yes.
But if u have like only 5% of the buildings super hard and only there will spawn the best stuff. U will run out of buildings to loot in a short time. If u can only obtain the best of the best loot wiht quests only in those buildings u are cutting the players freedom once more. ppl Like choices and as much freedom they can get when it comes to open world games.