[taylanub]

Late clarification because I wasn't careful and forgot that "NIH" has very negative connotations:

When I say "NIH is sadly a real problem for GNU," what I mean is that NIH can be an actual valid reason for GNU to fork or reinvent something, not that they're guilty for doing so. As in, it's unfortunate that they'd have to do it, but sometimes they have to. (Often it's not "reinvent" at all though, instead merely maintain an upstream compatible fork such as IceCat or Linux-libre.)

The reason is that if a non-GNU project is heavily relied on by GNU, the project might one day decide that they don't exactly agree with GNU anymore, so it's best to have a fork under GNU which can be fully trusted. Sometimes I find this non-trusting stance sad, but it seems to be necessary; just see Mozilla adding DRM to Firefox. :-(