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I found my own answer. The 'Who Has Seen This View' feature is still here in 10.4 but not at the bottom of view anymore. Here is what Tableau doc 10.4 new feature says about it....
Learn who has seen a view on Tableau Server
If you own a view, you can quickly find out who at your organization has seen it. At the top of a main site page, click Views, and then hover over the specific view you're interested in, and select Who Has Seen This View? from the menu at upper-right.