The thing about Tableau is that they're really the industry leader in terms of data exploration workflow. Users love the tool so much that they expect any new data system put in place to work with it so even vendors that are trying to put out their own data exploration ui are partnering up with them to provide the best-of-breed sort of option where they can still sell you the data system, but your c-level who will not even consider using anything but Tableau can still use it.