The idea that ex-Anglicans need a protected environment has nothing to do with the Church's practice in regard to ethnic parishes. The primary reason for establishing German, Hungarian, Vietnamese etc parishes is/was that the relevant group didn't speak English. Even when the Mass was in Latin pastoral ministry required a German etc speaker, and mass in the vernacular added another motivation for having ethnic parishes. I think this was a matter of necessity, not a mere welcoming gesture.I think a conclusion we might draw from the question my correspondent raises is that, if "Anglican patrimony" is hard to illustrate consistently from what we see in the OCSP, we have to look elsewhere for the problem we're trying to solve. I keep coming back to the employment problem I've seen from the start: TEC parishes, a shrinking job market overall, have still fewer opportunities for straight males. "Continuing" parishes are disappearing rapidly, probably at a greater rate than TEC.As successive groups have been assimilated and immigration from various countries declines, their ethnic parishes are closed or repurposed unless the group in question has the numbers and the resources to maintain them. As you point out, once everyone can communicate there is a lot of benefit to having a congregation made up of people from many backgrounds.
The lack of consensus as to what the Anglican Patrimony consists of adds a further difference. Contrast the guitar and electric keyboatd music at St Timothy's, Catonsville, versus populum celebration and modern Gothic chasuble, with the lace, fiddleback, ad orientem, and Renaissance musical repertory of BJHN. I could multiply examples.
But the other main line denominations are in the same place -- a Lutheran pastor acquaintance recently gave up his position to become a house-husband so that his wife could replace him as pastor of the parish.
So the Catholic options for married clergy look progressively better. The problem I see is that the best cis male candidates in any Protestant denomination are still finding jobs without going to a Catholic second or third choice. The OCSP is getting a lot of men whose careers as Protestants stalled in middle age, or who couldn't even start a Protestant career after seminary.
I have a hard time getting away from the impression that the OCSP is a full-employment program for Protestant mediocrities. I wonder what would happen if members of the smaller OCSP communities were to try mass at several diocesan parishes in their area and then come back to see the thin gruel that's available back in the OCSP.