Perhaps the basis for Porter's objection, Iconodule, this this:
Indeed, in some ways, they are like many who say “’I don’t need the church; God is in my soul.’”
As the number of churches have grown, there has been observed a trend toward “self-organization of those believers” who are not prepared simply to obey the priest in all things. They use the church as a kind of base, but in fact have “emigrated” into a kind of Kitezh in which they are on their own.
If such an anti-ecclesiology reigns supreme among these people, they are the ones attacking the holy Russian church. What that sounds like is ecclesiastical disobedience, and not some kind of neo non-Posessor movement. Indeed they seem a bit like neo-Pomortsy.
I say this as someone who loves the Russian Orthodox Church, the MP, ROCOR, the canonical UOC, the Church of Japan, and all of the other canonical autonomous subdivisions thereof, including the legitimate Estonian Orthodox Church, and who regards the OCA as autocephalous because the Moscow Patriarch, as an autocephalous primate, has the power to grant autocephaly (and I reject the claim of the EP hat anyone has the power to revoke autocephaly except for the Holy Synod of a jurisdiction that no longer desires it).