If they’re using using the resources, then they’re necessary. But if you’re allocating resources to VMs and they’re going unused, just… allocate less? It’s very rare that that’s caused any issues. Just remember to bump them up if you see issues before calling support.
If they complain it doesn't match their spec you can always allocate what they want but set a lower priority for the VM. Obviously, performance problems are then on you if there is an issue. That will at least appease the low-level support person that will just knee-jerk and blame the lack of required resources when you call for support on something unrelated.