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.
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.