No they do affect you, because the next batch of Pastors/Ministors you are going to have to interview for your parish are going to be trained and educated by the principles of that far away group has endorced...
That's the problem, you may believe your parish is immune, but its only a matter of time, and by the time these local churches wake up to do anything about it, it's too late.. the inmates are already running the assylum
To those in ECUSA, you are correct.
We have our own seminary, however, and my experience of its graduates (including our present rector) says it is stellar.