Re: I've always felt uncomfortable with this statement
Serial-over-lan works perfectly to access the BIOS with any decent server. I do it on a regular basis, back to those 2950s. Plus ipmi allows you to change several settings from the command-line without entering the BIOS.
Windows has had serial-over-lan support since 2003. Microsoft calls it "Emergency Management Services". It's enough to get your booting or networking issue sorted out, then you switch over to RDP, remote MMC, or whatever.