Anyone who has played modded Minecraft knows that "holding reserves" is far superior to actually producing just in time. If you don't put resources on passive you'll spend too much time hunting them down when you need them instead of building up a supply in the background, your production will have a harder time scaling to new demands, and you're acutely vulnerable to supply chain disruptions like a creeper blowing up your mob farm. People are saying "why didn't we produce just in time" ? Well, there we go. Play modded Minecraft. You'll see just how bad not having buffers is in a simulated factory
Same with Dwarf Fortress. Having significant reserves is essential to survival. There's so much weird shit that can happen to disrupt agriculture and industry. You might end up having to hide inside your fortress for years because some god awful super-monster is standing outside the gates yelling "come outside i just want to talk!" Or your miners breached a caver and now your mine is full of giant cave spiders so you have no more iron until you figure out how to deal with them.
Same with Dwarf Fortress. Having significant reserves is essential to survival. There's so much weird shit that can happen to disrupt agriculture and industry. You might end up having to hide inside your fortress for years because some god awful super-monster is standing outside the gates yelling "come outside i just want to talk!" Or your miners breached a caver and now your mine is full of giant cave spiders so you have no more iron until you figure out how to deal with them.
Refined Storage is one of the absolute best mods.