What blobs is this guy talking about? Device drivers and/or the APKs that support them? Those have existed since forever. Google used to publish them to the AOSP repo. If they've stopped doing that, it's not that important, since they can be easily extracted from the system images, or from the devices themselves.

Google apps/libs? That's a growing problem, as more and more apps are starting to rely on those, hence MicroG.