People pick and choose the advice they think is really important and then massively judge those who choose other bits!
This.
This x 100
The advice on room sharing is well intentioned, but I either don't think it was meant to be taken as literally as some people take it, or the writers had never had a child.
I remember reading a post on FB from a mum whose baby had unexpectedly fallen asleep in their spare room. She was bored, needed a wee etc, but just conceded thst she'd be stuck there now because she simply couldn't leave the room.
The advice has just fanned anxiety for people already anxious.
On another thread now, a new mum has asked if it's OK to leave her sleeping baby for a quick shower - the response is most people saying that's fine, so it's not even consistent views over Mumsnet.
For what its worth, I took a middle approach. Baby had different nights and days from birth (so nights were darker, quieter etc), and switched into day/night mode immediately. She got herself into a 7.30-7.30 (with feeds, but went straight back) routine, but we kept her in the lounge in the evenings until 3m, as until then she wasn't bothered about the TV etc. Then upstairs to our room until we joined her from 3-5m, and then into her own room a bit earlier than we'd have liked, because we were disturbing each other too much and her sleep as suffering.
Day naps, initially in the moses downstairs, or sling or pram, and we'd just mill round the downstairs, but not necessarily in the same room, but gradually relaxed it.