So in following along various posts and tutorials for network booting (PXE) Raspberry Pi's, there is a line of code to regenerate the SSH private and public keys. Interesting indeed. So if the theory or case is that the primary system keys would be identical to the other PXE hosted keys for subsequent systems (A, B, C, D, etc.), then why is this regeneration of keys not needed for most other Linux distros and freshly burned images installed to computers, USB flash drives, or liveCDs?