AngryData parent
Whats wrong with redundancy? Not having redundant supply of anything is a problem as human history has repeatedly shown. I think this kind of modern "more profit = more better" is just a ticking time bomb for a massive disaster, and it isn't like we haven't had any warning signs about critical supply problems for any number of resources and goods.
If you can print the money required with no bad consequences, go right ahead and build all the redundancies.
The problem with bleeding-edge fab is it's a (fast) moving target. It's not a solved problem. And customers can't simply migrate their designs to a different fab, as the designs are increasingly specific to a process.
I do think we need more fabs but not this kind. Very low cost fabs with standardized PDK and open(ish) tools, should be as simple as ordering a PCB. Not going to happen anytime soon though, needs old fabs to stop production and the bleeding-edge to hit a hard wall. Can't compete with fully depreciated legacy fabs/nodes.