Apple is an incredibly mercurial company that sometimes gets too busy telling you what to do that they can't execute small things.
Look at poor iMovie, which has had most useful features stripped by this point. Or Pages, which actually broke file compatibility with little or no benefit. Or the situation with Wifi, which is a fuckup of monumental proportion.
On a mid 2012 13" non-retina (the 16 GiB hackable, 2 SSD one) MBP, fixed wifi by doing a clean Yosemite install, no transfer settings and then deleting network preferences plists. :(
Works, stable on 10.10.1. (Discoveryd mdns announce disablement doesn't flag doesn work at all though.)
Look at poor iMovie, which has had most useful features stripped by this point. Or Pages, which actually broke file compatibility with little or no benefit. Or the situation with Wifi, which is a fuckup of monumental proportion.