If you had continued to read the rest of that paragraph, you would have seen this:
> If someone else is doing it — link to it. If we can provide resources (like APIs) that will help other people build things — do that. We should concentrate on the irreducible core.
I had continued reading it, and I maintain that single sentences must make (at least logical) sense by themselves. This is marketing jargon trash, and should not be encouraged in a web standards document!
> If someone else is doing it — link to it. If we can provide resources (like APIs) that will help other people build things — do that. We should concentrate on the irreducible core.