don't these boxes already have a BMC? KVM is kind of poor man's BMC.
It would be a bit odd if a place was deploying new Dell servers and slapping IP KVMs on top of them.
So you end up with ipkvm because there might be windows server that requires remote display, or because for various reasons IPMI SOL or equivalent does not work properly (BIOS mode enabled instead of UEFI, SOL requiring extra license, etc). Or even not being able to setup autoconfiguration for BMC but for various reasons it's easier to setup ipkvm.