"The proposal seems at first skim to be a copy of a few existing technologies from Bitcoin's roadmap and were first proposed by Greg Maxwell and others*: weak-blocks & network-compression/IBLT to reduce orphan risk, and flexcap (or a variant of it perhaps)."
I know speculation is futile, but I can't help indulging.Where did he even get that?
The subchains paper is completely implementation agnostic. It belongs to Bitcoin. As far as I know, it was the first scholarly paper on the topic of subchains/weak blocks. Everyone is free to use the results and formalizations as they see fit!Where did he even get that? We have no proposal for any of the options he specified unless he considers Peter R's subchains a "proposal". And we have no roadmap.