God forbid you're grouped into a caste of skill sets based on experience and/or expertise. If you started off with a homogenous group of developers and set them to work on building an MVC app, the group would eventually split into who favors scripting, css and markup versus those who prefer writing business logic.

Hire what your team needs. If you need a duct tape dude who can do a little bit of everything, great. If you actually assemble an entire team of those guys, good luck.