It's been six years and they still won't say "it's Nutanix but better". Is it not better? Does the "we akshually don't have competitors" approach work with customers?

I don't think we'd ever go with the "we don't have competitors" line, it's not serious. The competition is more AWS, GCP, and Azure than it is Nutnaix though, they can't provide a similar experience or economic value when they don't make or control their own hardware. That doesn't mean we never see Nutnaix, but it's not the most apt comparison. As Alan Kay famously said, "People who are really serious about software should make their own hardware" - otherwise you'll be stuck at the intersection of support and scaling pains long term.

What company specifically mentions its competitors in its advertisements? Do you expect the homepage of the company to be a list of links to its competitors? What is this absurd expectation?