Disagreed. As a newcomer to Grafana, some features were hidden because of privileges and I was super confused about how to do them.
Being disabled with a tooltip saying 'Not available for your user. Contact your administrator.' would have massively helped me rather than going on a wild goose chase.
That's a pretty good counterexample, and probably the more common one. But what if your company only paid for a tiny subset of the product? Would you want to see everything that's unavailable along with a tooltip even if it really detracts from the user experience of the features you did pay for?