Really can’t see what the risk is TBH, if you’re stupid enough to try and use a hairdryer in the bath you’re probably stupid enough to run an extension lead in from out of the room, too.
When you build a house you can’t legislate for all the people who may one day occupy it, or the whole of the lives of the people who occupy it. Only an idiot might use a hairdryer in the bath but some people are idiots and they live in houses too. They don’t live in special idiot houses, they live in the same houses as everyone else. As do children (who are just little cute idiots), and people with learning disabilities, and people with brain injuries, and stroke victims, and victims of mental illness. And we’re a generation that will longer than ever before – plenty of us on this forum will see senility or dementia one day. So our houses are built with a view to who we might be one day as well as who we are now.