Got to say, and this is from hitting 100+ days in, albeit in 17.1 not .2, the only slight issue I've had has been in the usual bones/glue/duct tape crafting chain. Even then I was easily able to supliment my looting with the odd visit to a trader.
You could maybe make the argument that some sort of plant/tree based crafting of glue should be possible. You can make glue out of tree resin or plant mucilage for example.
Brass and iron haven't been a huge problem for me but then I'm predominantly a melee fighter, even when I don't need to be. When it comes to horde night I'll use the ammo then. I don't tend to rely on traps of turrets, instead I rely on good base design (not including AI exploits).
I think a lot of the resource thing also comes down to how many are in your party. I play solo, but I've watched multiplayer streams where they are very wasteful either when fighting hordes or crafting items. As to be expected I suppose, but essentially when you have a group you find you'll use 2 to 3 times the amount of ammo a single person would. That's a generalisation, I'm sure there are some very strict resource managers within multiplayer too.