At the risk of being told....Sorry to ask about this but the post has truly confused me
We have to RA in order to minimise risks....we cannot prevent 'accidents' altogether.
Children do slip on grass and do fall ....but to replace the grass with something else is not required.
If there is a post in the garden the children are likely to bump into ...we encourage children to risk assess
That is what I have learnt from many training courses and reading Tim Gill too...and which Elizabeth Jarman herself endorses
https://pbs.twimg.com/media/B1a_oUjIQAE8uPE.jpg:large
If I have misunderstood the OP then I apologise