@speakout : we didn't plan this arrangement, either; just seemed to us that closeness and calm (for our child and for us) trumped separation and stress.
This, of course, was made an easy choice by the fact that we were all sleeping well and happy with the arrangement.
We did attempt to have our child sleep in her own room at some point (because our maternity nurse insisted it was "correct"), but sleeping with one ear open for a baby monitor was, for me, far more difficult than just having our DC close by.
For us, parenthood during her first year meant an increased level of vigilance during the nighttime hours that we could not control, and couldn't have anticipated pre-the arrival of our dc.
DC was also EBF, so sleeping together was simpler, easier and more restful for me.
Later, post-weaning, the decision to continue co-sleeping was not about a failure to enforce boundaries, or ceding control of our nights to the whims of a child.
Instead it was about our realisation that we loved having our DC close, and that the DC loved it as well. With that understanding it was clear that since our wants and those of our DC were in sync, forcing our child to sleep away from us would, in our case, have offered us nothing but the approval of others.