It buys you stuff. Whether it is necessary depends on whether you need that stuff and how much you are willing to pay for it. By stuff I mean things like suppo

It buys you stuff. Whether it is necessary depends on whether you need that stuff and how much you are willing to pay for it. By stuff I mean things like support for migrating a multi-thousand VM component between multiple cloud providers (and possibly your own infrastructure) while maintaining service levels across geographical regions and not having to make your other services aware of the migration. Or maybe routing that takes into account the current state of the rollout of a possibly-breaking upgrade of the backend VMs. Want to go from "treat your VMs like cattle, not pets" into "treat your (micro-)services like cattle, not pets"? Then maybe this stuff is necessary.