There are risks with all sleep scenarios- it's about what works for you and your baby- and what your gut instinct tells you will keep your baby safest.
In our case:
I breastfeed and cosleep with our 6mo. We also - because we live on a narrowboat which gets down to about 15 degrees at night- use a thin duvet. I used no duvet and a growbag with him- but stopped that when he turned over in it one night at around 4 months old and somehow pulled the neckline taut against his throat. Woke up to him wriggling against it. No idea how it happened but I wasn't risking it again- and have no idea if it would have led to a choking incident or not. We started cosleeping because he had mild silent reflux and would often gag/ begin to choke on his posset while sleeping- which was terrifying. He grew out of that around 3/4 months thank god.
I decided the safest thing for us, was cosleeping with myself curled around him in a C, and a thin quilt tightly tucked over our legs. He sleeps on his side, and as he's a very big baby, manages to get his leg hooked over my thigh and his hand on my face. We don't use pillows or other bedding etc. We always wake up in the same position we went to bed. I know DS does latch on and off at will in the night and I tend to wake when he does, check his nappy and make sure he's warm enough etc. But we always revert to our "position".
DP sleeps in the other cabin, as he takes strong painkillers. I dont drink after 9pm (have one small glass of wine with dinner) and I have a crib I can put him in if I feel extremely tired.
It works for us and my gut instinct tells me this is the safest way to sleep with my baby.
I think that knowing realistically the risks, and assessing them/ weighing them up is a hugely important part of being a parent. It's why I choose to feed my baby some foods and not others I don't think he can manage yet as we BLW. It's how I weigh up how many layers DS needs in his sling, and whether he's old enough to go in the bigger bath yet (DP says yes- I say no- so he doesn't).
Trust your mum instincts. Do proper risk assessments and look at what may happen, and how to mitigate that, and if you feel uncomfortable doing something- just don't it.
But don't guilt others into doing things by what can be arbitrary guidelines, given out because the NHS cannot quantify risk, or trust that all parents will have the common sense required to cosleep, drink within safe limits during pregnancy / breastfeeding, or whatever else we're all worrying ourselves silly over this week.