Can I just say that I have a working bred border collie and she is super gentle and tolerant with children.
I took her to a fete once and a 2 year old decided to pull on her canine teeth! (His dad asked me if he could stroke her) and she just sat there smiling, arse wiggling.
While it is true that as a breed they are not known as nanny dogs like staffs and retrievers are, if you get a properly bred collie (as with any dog), socialise them with children (as with any dog) and don’t tolerate any herding behaviour towards them you are unlikely (IMO) to get many, if any problems.
Problems with collies specifically and kids tend to happen when owners that think it’s funny to allow them to exhibit herding behaviour towards the kids, it is not amusing, it is a bite waiting to happen!
Mine is not too good with other dogs but that is not due to her breeding, it is due to repeated traumatic experiences with other dogs.
Based on your first post, I would have recommended a collie.
While they are intelligent and active dogs they do not need masses of exercise and brain training a day.
Properly bred ones should have an ‘off switch’ and should not be hyperactive and neurotic.
I have never met a ‘proper’ working farm bred collie that was neurotic, yes they can go all day outside if you want them to but they are generally calm in the house, mine virtually never barks.
I have met some very neurotic, poorly bred, nervy specimens of agility/flyball breeding, I would probably avoid those.