Well as a single parent from the very start, DS has always kept with me. But he has his own bed too and now flls asleep either in his own bed or mine, but always wakes up in mine. Anyway, while I do agree with co-sleeping, it makes no actual difference at bed-time. DS never cries or screams but does protest bedtime, no matter which bed he sleeps in.
The article implies we all lovingly go to bed with our little ones, but in this day and age how is that possible? We are busy, we need to stay up later than 7pm and get stuff done. Realistically, our society is far more complicated these days and most of us work away from home too so our children need much more independence from a younger age. It's a far cry from village and hunter gather simple lives of the past or in other parts of the world where people live like that. Plus, while many of us like/agree with co-sleeping, for many it's not a natural extension of parenting. We are not all the same, as simplistic and idealistic this article suggests it should be. It may be somewhat exclusive to western society, but that's because we are progressive and live very differently and have the luxury of choice. It implies societies where mothers wear their babies and co-sleep are more natural parents than us westerners, but the author fails to consider that perhaps it's simply a case of having no or little choice to co-sleep, rather than doing it naturally per se.
I doubt I'd have dramas getting DS to bed at night if I went to bed with him, but I can't. He's already asleep by the time I hop in bed, so yeah it makes no difference to bed-time rituals and routine.