What's Fedora Up To? Ask the Project Leader
Fedora Project Leader Max Spevack offered himself up for this interview because, he said, "I look at stories like [your] posting Ubuntu to Bring About Red Hat's Demise and many of the comments about Red Hat and Fedora seem very rooted in the world of several years ago, when the RHEL/Fedora split took place." This is a chance to clear the air, and get an up-to-date look at what Fedora is up to these days. So ask away; we'll send 10 of the highest-moderated questions to Max and (hopefully) publish his answers later this week.
They've actually answered your question in the FAQ: here. Basically it boils down to patents and licensing fees.
True, but Ubuntu has Mark Shuttleworth. Mark Shuttleworth brings two things to Ubuntu that most other distributions don't have: money and ambition. Just look at Ubuntu bug #1 - https://launchpad.net/distros/ubuntu/+bug/1.
I can see why evince depends on nautilus:
This is a case where packaging the extension in an evince sub-package (i.e. evince-nautilus) should be considered.