Re: Blast from the past
1) Because it's the means by which you install the OS, or at least configure it for network boot in order to make it install an OS as needed. And diagnose problems or view error messages that prevent network connectivity. And do firmware configuration.
2) Because it's cheap, and because VGA KVMs are really, really cheap, including the sixteen-port-per-unit, stackable sort of KVM you want in a datacenter.