Automatic rendering is fine in small projects. Seemingly random appearance of widgets would, however, drive the debugging person crazy.

Comparing this.render to Bloop.renderComponent is superficial. If rendering needs to have a handle on different resources, you'd either violate the encapsulation in the former example, or write a service to couple them on a separate layer -- that service might as well be called Bloop.

Some of this crap makes hard things possible.