Hi, I post mainly on the early childhood board but the subject line of this post caught my attention.
I've spent many hours sleeping with kids for various reasons--I had to become a "sleep at all cost no matter where" type mom due to children's sensory issues, serious separation anxiety, chronic sinus problems, ear infections, and a little daughter we just didn't have a room space for. Sure, I would have rather had uninterupted sleep in my own bed without kids through all of those years but my children just weren't there yet.
BUT, when my difficult child's issues settled down and space freed up for my daughter, I did gradually work towards them learning to fall asleep and sleep through the night independent of me. This transition didn't happen overnight, especially for my daughter who had mostly slept with us from birth to age 5, but it did work out gradually. There are still brief periods when someone needs to sleep near mom for some reason (sick, anxious, upset) and I've no problem with that but I'm glad--and so are they--that they normally can handle this without needing their mom. I think there's something to giving kids the opportunity to live up to what they are capable of in terms of independence.
I don't think it's emotionally detrimental to sleep with familiy members, but I do think in our culture most children will encounter situations where they need the ability to handle it on their own. Our job as parents is to raise children who can function well independently of us and that includes the hours of nightfall just as it does daytime. I want my kids to be able to go on sleepovers and to youth group outings and be comfortable enough with themselves to get to sleep and sleep through the night on their own.