Raiders already raided it and left all the sleeper zombies inside intact and alive? I dare you to find plausible excuse! I can shoot any of them down!
But really, you can already make iron tools on day one, By day 3 I had all of them, so why fill loot tables with stone crap, that cannot be smelted, sold (for the most part) or used.
Honestly I am really not fan of the sliders. I as player want a plug and play experience when I do not need to think about it much. One slider to rule them all. I play on moderate, it gets easy - I start new game on hard, harder, hardest.
Choice is certainly good. If it is meaningful. This is not one of them. Meaningful choice is currently whether you do Str or Int build. How you build your base is meaningful choice. If you buy this item at trader and wont be able to afford the other one is meaningful. But for the most part epic item one tier bellow will win 90% of the time because it has 4 mod slots, so I would not say it actually is much of a choice. To me it boils down to: Oh new item. Uhm ok, I guess I can smelt it. It could perhaps work, but it needs balancing.
I would be careful with claiming most players like the stone age. That is hard to prove. I cannot prove most players dislike it either.