When considering a tool with which one will work for many hours a day and many days a month over the course of years, for some people it makes sense to use expressive power rather than initial ease of use as the primary criterion for choosing among alternative sets of bindings. In the case of a tool like Emacs, the user is always likely to encounter new alternative work flows or to invent them theirself. This is what Emacs offers as an alternative value to Vim's Unix philosophy based idea of doing one thing and only one thing well.

There's nothing wrong with Vim, and nothing implicitly wrong with using Vim shortcuts in Emacs so long as one is aware of its Fortran in any language style limitations.