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.
It kind of sounds like a cautionary tale for other tech companies wading into the health space or medicine (e.g, calico, deepmind).
On a long enough time horizon, everyone's survival rate goes to zero.
It was just IBM throwing stuff at the wall to try and keep up with big tech companies. They have been in decline for a long time, and I assume this marketing stunt did not fool anyone actually involved in the businesses of healthcare or tech.