It wasn't a product. It was a business unit created by the acquisition of (at least) 4 separate companies that had wildly disparate products, data sets, and consulting teams. The only thing they had in common was the focus on healthcare (and even that could mean anything vaguely related to providers, payers, or life sciences). "Watson" in general evolved into little more than a branding that was applied to anything remotely related to AI, analytics, or data management.