Think we are well past that. Even if these companies had huge stockpiles, they would have been depleted long ago.
No company is going to hoard multiple years worth of inputs. Supply has remained high in semiconductors too, it's more of a demand than supply problem. But of course, elevated demand and normal supply leads to shortages just the same as normal demand and shortened supply.
I hope not, I like the cheap goods that just-in-time produces.
If you look back at what many were saying at the start of Covid you would have thought we would have all been eating our neighbours by now. The reality has been completely different, an artificial shortage of toilet paper and a slight tightening of supply on consumer goods. If anything this tells me our supply chains are quite robust.
There are a lot of things we could have done differently to prevent the current issues. Reducing capital efficiency by requiring massive stockpiles isn't necessarily at the top of the list of good ideas. I'm not saying it's a bad idea, just that this isn't necessarily the first thing we want to jump to across the market.