Is it needed? Only if you want to keep the warranty coverage in effect.
Which manufacturer requires that??
None that I know of. I’ll admit that certain things are REQUIRED to keep your warrantly…like oil changes…but the 30k checkup is NOT one of them. Sure they may do an oil change and possibly a tranny fluid change. As long as those are done within the recommened interval you’re fine. But the other stuff that this $400 service is calling for in no way will void the warranty if not preformed.