How many internet routes change per second?
How many dollars per second would pay for enough CPU's to sign every changed route? I'd bet less than one... I'd guess 1000x less than one...
We both know there are still garbagey nets out there using ARM32, MIPS and who knows what else out there for control plane processing. Only the big guys are gonna upgrade to support this.
kern.version: JUNOS 18.XXX.X #0: XXXX-XX-XX 03:28:10 UTC builder@svl-junos-p001:/volume/build/junos/18.X/release/18.XXX.X/obj/powerpc/junos/bsd/kernels/JUNIPER-PPC/kernel
There certainly are some routers that use x86 based CPUs, but they're embedded versions which you'd be unlikely to use on a PC.
The first namely being that nobody is going to do that unless they have too much time on their hands and don't actually run a real network. "Just loading routes" into a router is not really that straightforward.
Raptor sells desktops with IBM POWER9 CPUs – https://www.raptorcs.com/content/base/products.html – they are expensive, and the same amount of money would buy you a much more powerful x86 system, but they exist.