If you check the ARCore announcement, "ARCore works with Java/OpenGL, Unity and Unreal and focuses on three things:", shows what the position of the NDK is.
Nothing more than a way to implement Java native methods, which I completely ok with, given the security implications.
Just wished that since they have their own fork of the Java world, that they would also bother to provide something else besides forcing us to manually write JNI calls.
