True! And FWIW I actually have a problem with "reality TV" in the first place, but that's a whole 'nother issue.
For the rest, I honestly know very little about Amish, although yes I have heard of that practice. They were just the example that popped into my head that fit many of those same arguments but seem to be generally perceived in a more positive light (certainly not by everyone).
As far as sending your kids out into the world from 16-18...well, I wouldn't do it! Would you? Not that it matters, it's just a thought that occurs to me. I think the shock of being out in the world at 16 would be enough to send most young people scrambling back to safety (I know a few exceptions personally, but still...) and probably isn't really so much a testament to choosing one lifestyle over another as simply being too young to be out there in the big world in the first place. Of course that's my opinion, and my opinion on that probably has nothing to do with the subject at hand.
From my own observations in life, I've noticed that there are people from pretty much any/every way of life or religion of their upbringing who stick with it as adults, and others who do not. I know people who were raised within strict church environments or other kinds of lifestyles with rules or practices that might seem very "extreme," "different," "weird," or "cultish" to others, and who do not follow that way of life as adults. And, of course, others who do.
My point is that ultimately I think the Duggar children and the Bates children
will choose for themselves. If they choose to live as they were raised, is that necessarily proof that they were brainwashed? I honestly don't think so, any more than is necessarily the case for any individual Catholic, Muslim, Mormon, etc etc etc.