LOT:
As has been discussed before on the CR, the logic of what you’re saying sounds good, but it’s not the reality. BT’s are far more likely to go OTD than FFB’s. I don’t think it’s entirely their fault, but it’s clearly how it is.
The fact is, most BT’s start around college time. They aren’t going to reach the point of “I can’t believe it’s not FFB!” within 3 or 4 years. The traditional kiruv system (excluding Chabad) does not put a big emphasis on integration. They just assume BTs will magically know how to integrate after they leave yeshiva, which is why half the time they end up hopelessly lost afterwards and go OTD. None of this is their fault. It’s a broken system.
When they do try to shidduch BT’s with FFB’s, we all know we aren’t talking about right-wing, Lakewood-style FFB’s.
As a side note, from what I’ve seen, Chabad’s system does emphasize integration, and it produces successful BT/FFB marriages (albeit, maybe not BT/Gezhe).
edited – Did you really think we would let that through?