Then, seeing we have the same understanding, I believe we only have a different standard of quality. Because I personally believe C2A does not give adeguate quality when filling big areas.
I mean, here are a few shots from Humus C2A demo (with a modified texture).
Close-up of the screen-door effect mentioned.
But let's leave that alone as OP is not interested.
Personally I believe the pattern on the middle window is quite apparent.
Nvidia thinks it's not sufficient, but they turbocharged the concept with Stochastic Transparency.
AMD also thinks it's not sufficient: OIT using per-pixel linked lists.
Now, I understand this is worth a try. But saying that C2A could replace blend... I don't think so. It looks fairly different from blend in my opinion. Therefore, I am not suggesting anyone to try it with the intention of replacing blend, not even for the easiness of implementation.