>>24171More developer and community support.
With Gentoo everyone is basically running a completely custom system, with custom binaries, and packages compiled with practically infinite possible combinations of options (features enabled/disabled at compile time through USE flags).
This is fun, but highly chaotic, not good for stability or support.
Binary distros have thousands of people using the same exact set of binaries, if you have a problem, you can bet hundreds or thousands of other people do too, and the problem is going to be fixed or be made known.
Gentoo also has a lack of support. Sometimes ebuilds go months without getting simple fixes that are needed. Many poorly maintained ebuilds.