There's no misunderstanding here. You're removing a feature which a lot of us use and pay for. This sucks.
They probably determined the excess bloat and strain on their infrastructure from git cloning huge binaries outweighed the benefits so they are removing the feature.
Which, conveniently enough, is exactly what they want us to do ourselves now. I already pay GitHub to do that for me, how is it a benefit for me, the paying customer, to do that myself by hand?