Exactly - there is no problem.
In fact it could be argued that kids who grow up having their own bedroom miss out on a great deal of “socialization training”.
If nothing else, they really appreciate it when they finally get their own apartment.
I’m irritated when articles like this generate a lot of comments to the effect that there’s something wrong with having a lot of children. No, the proximate problem is that they’ve chosen to mooch off the UK welfare system, but the bigger problem is that there IS a UK welfare system for them to mooch off.