I feel like it's disingenuous for people to insist that there's "no" reason to sleep in the same room.
If you follow the guidance properly that does involve not letting them sleep alone. A baby monitor doesn't replace a human and nor does checking in. It's not about seeing them stop breathing it's about preventing that happen in the first place with the sounds of your breathing, snoring, shifting etc.
We take risks every time we do anything. Crossing the road is a risk. Getting in the car is. When it comes to safe sleep and car safety we all balance the risk with how concerned you are, what's practical, whether it's worth the stress to you. We all end up somewhere on the risk spectrum based on what feels right to us.
I completely understand if someone says that they made a choice not to follow that specific guidance for their own sanity and it's a level of risk they were comfortable with. But I think its unfair to insist the guidance is bullshit just to feel better about not following it. If you're making a decision that a reduction of risk (to an already small risk) isn't worth the sanity hit then just own that.
The guidance is based on research and it is the safest way we currently have. If the guidance was different when you had your kids then that's fine - you did the best thing by your kids by following the guidance. If in 30 years it turns out that actually it's safer for them to sleep suspended from the ceiling by their legs listening to turtle noises interspersed with subliminal positive affirmations then that's fine too. I'd understand that mums would do that instead of doing what we do now because then they have new information.
But saying "oh just do this because my kid did and was fine" shows a fundamental lack of statistics. Of course the majority of children are fine without following guidelines. The guidelines are there to reduce the number who aren't.
I did follow this specific rule with my own and didn't find it a problem at all. While small enough for a Moses basket he just slept in whichever room we were in. If I needed to get stuff done I'd either wear him in a sling or he would be sleeping in his Moses basket in the room I was tidying etc.
Once bigger and in a next2me he had already started to contact nap anyway. I tended to just pop him upstairs in his cot whenever I was going to bed for the night. Or sometimes DH and I would both watch tv upstairs in bed while he slept until we were ready to go to sleep. Or I would sometimes just go to sleep really early, especially during phases where he was waking up a lot as I was exhausted.
To be honest for the first six months his reflux was so bad that he was living a very vertical existence anyway and so he wasn't sleeping happily in his cot for 12 hours a night. Maybe it would have been more tempting to relax that rule if he had so I could have a break. I don't judge people for doing what was best for them. I do judge them for insisting that everyone else should do the same as if the scientific research available is rubbish.