I'm not sure if this issue can be reported here or not - but I think it's likely that some people are getting a downgraded Visual Studio experience when upgrading a web forms application to incorporate MVC as well - particularly if they intend to use Razor
as their default view engine.
Unless you've created a ~/Views folder in your WebForms + MVC hybrid project, ASPX will always be selected by default by the Add View dialog (on first showing - I know it remembers the last selected engine).
For the specifics of the issue please see
this Q+A that I've just posted on Stackoverflow
Whilst it's true that many such upgraded sites will probably have a ~/Views folder - I believe it's likely that some will be like us - and start off by doing everything in Areas. Because the Add New Item dialog doesn't look for an ~/Areas folder as well as
a ~/Views folder, you have to create an empty Views folder in order to get Razor selected as the default view engine.
A simple change to the
method to check both of these folder locations would fix the issue.