It&#x27;s not just about replacing the controller, which nobody understands or agrees on [1] -- it&#x27;s about getting away from the idea that you can oversimplify user interface architecture down to a holy trinity of just three elemental concepts.<p>You could just as well ask &quot;If Earth, Wind and Fire [2] are obsolete, what replaces them?&quot;<p>There&#x27;s more to modern chemistry than Earth, Wind and Electricity.<p>[1] <a href="http:&#x2F;&#x2F;c2.com&#x2F;cgi&#x2F;wiki?WhatsaControllerAnyway" rel="nofollow">http:&#x2F;&#x2F;c2.com&#x2F;cgi&#x2F;wiki?WhatsaControllerAnyway</a><p>[2] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Classical_element" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Classical_element</a>