I'm glad to see more people following this approach.

The real consequence of having the community diverging on build tools is the added work required by tool creators to support them. I created a tool that included a grunt wrapper just before gulp became the new 'hottness' and quickly became fed up with the whole mess.

Soon after, I discovered that npm scripts can call the bin scripts of locally installed dependencies. I haven't looked back since.

NPM scripts make composing tasks nice... and there's nothing stopping you from adding custom configs to the package.json object.