Very interesting article that talks about the progression of Google's closed source app alternatives: https://arstechnica.com/gadgets/2018/07/googles-iron-grip-on...
I always thought that sure, they're deprecating old apps for the closed source Google version, which sucks, but at least AOSP still comes with barebones versions.
But now AOSP, a mobile phone operating system, will come without calling and texting ability? How can Google even do that? These apps, old as they may be, can also still serve as useful reference points for making your own OEM-branded app.