That is an odd list. Why are you hoarding
- flint stones? the only use after your 2 workbench items and axe are low quality arrows (compared to fire).
- beech seeds. A few, ok, but you will be planting birch and oak to get fine wood (portals drain it fast). Not much point in a beech grove to me?
- all kinds of leather. Troll hide is totally useless after you have the armor, and maybe one stack spare for decoration or whatever uses come along? Deer and boar hides are also useless after some point.
- abomination roots (after armor done, what now?)

I guess what I am saying is that you hoard things that you consume constantly: wood (fire, arrows, coal, house, lots!) and start tossing things you don't use anymore after that era (50 stacks of flint stones?!).

you did miss iron age: coal. Maybe your swamp didn't have a fire thingy. You also left off sut cores, for portals, though those can become too many really fast. Maybe you define hoard differently than I do... I was thinking > 1 stack of it.