As a developer for my company's internal LoB tools, I really enjoy WPF more than Winforms. I feel very empowered and, as a Microsoft shop, it seems to be really great for meeting a specific aesthetic and function for my users. Could I do it in a web app? Probably. But it would take a lot more work for me and I'd be battling compatibility with IE7 (yes, we're still on IE7) as the corporate web minimum spec. WinRT felt…
If you have the choice to deploy a WPF app, couldn't you ship something using chromiumembedded to get the benefits of a web app without worrying about browser compatibility? In the past, I've even dropped a CEF WebView into WPF and had the UI in HTML/CSS/JS.
We're able to produce a standalone desktop application and a web app using the same code and have it looking/working exactly the same, on different platforms.