Spares them from trying to make a wholly new Aberration race for PC usage.
Which, honestly, kinda sucks. Ever since they gave us playable Constructs, Oozes, and Monstrosities, I was hoping to see Aberrations and Undead next since WoTC was starting to get a bit more "daring" with what they were allowing us for PC options.
Would I like for the Elans to come back? Yes. I liked them a lot. Do I like the idea that they are taking the easy way out for Aberration pcs? No. Should I be surprised the easy route is being taken? Not really.