Okay Unity.
Now you have something to explain: Unity’s lighting is powered by Enlighten, right?
And yet all the time I read about Enlighten, it is promoting their products with Unreal Engine 4 like this AAAmazing demo.
Also, now even CryEngine is full engine source access, so unless you get the best out of Enlighten, might as well ditch them, get your own lighting solution, and let those of us who are serious about lighting go and make a deal with the vendors directly who are constantly updating it and know their product better. Your Enlighten deal is crippled in that sense.
And admittedly, it is not like I have the skills to mess with the engine source but I am pretty certain some Asset Store assets would be greatly improved with source code access and more than that, ‘we can’t open up the engine because of some custom licenses’ isn’t really an excuse but more of a way to slowly dig yourselves into a hole. (No hate here, if Enlighten does not suffer for you, then you should not suffer for them either, though I think it is more of the other way.)
I pretty much doubt those Unity Engine Licensors are doing it for the source but rather support.
Or being honest, I am just bitter we don’t have that while Unreal got it first even while Enlighten is the Unity integrated default lighting solution.