It's not a special case, its "sucessor" (Pd-l2ork/Purr Data) is here and is compatible to it. We can forget about extended, but it still counts if we're considering the newcomer. In this sense, it is not being or has been phased out, it's moving on... 

On the other hand, I haven't adopted Purr Data yet... and I still use Extended (0.42-5 by the way), where I have over 350 patches that I use for teaching which are compatible to this version... not to mention all of the documentation made for its libraries, so, yeah, you get my point, Extended patches are still around, a similar option is taking its place and behaves the same, so, yeah, I say we worry about it.

cheers