From what I remember, basically everything that isn't a phone or computer is on older process nodes that once were cutting edge. Some of these are so old that it doesn't make economic sense anymore to scale up capacity, or it might not even be possible anymore to easily do so.

As a result you have production lines that were reasonably well suited for demand pre-covid, now having to deal with everyone stocking up on way more parts than they need because they don't want to deal with shortages again.