Celebrating and acknowledging the importance of work doesn't mean turning work into an ethical principle. If anything, turning work into a virtue is, paradoxically, a tool of the capitalist class.
One argument I've seen against communism online revolves around arguing in favor of "managerial labor" - implying that under a communist system, that type of labor will no longer exist. A pithy expression of this argument is "someone has to write the checks!".
But, managerial labor is different than owning capital. In very small businesses, the owner is the manager, but there's nothing necessary about owning capital to then do managerial duties, and there's nothing necessary about being a manager that involves owning capital.
Billionaires keep coming after the Warren, which begs the question: why not Sanders? By focusing on Warren, they hope to drag the Left to Warren, as well as centrists to the Right.