It’s more like running multiple Michelin restaurants simultaneously pumping out millions of dishes to demanding customers.
Probably bad analogy still but …
From what I understand he high stuff is just really hard to get right especially first time round and you have the supply chain that is local and up the job too.
I saw a video of how they monitor the operations of these factories , that’s probably the secret sauce.
Other stuff that is tough is getting past the environmental regulations, the amount of water and electricity they consume. Taiwan has sacrificed a significant part of it’s natural resources for these factories.