Just that really. I'm sure that old homes have bathroom windows. We have a new-build 2 bed with an interior bathroom and we asked to put in a landing window to the side but were told no due to planning restrictions. The window wouldn't look into the neighbour's house. And even more ridiculously they have a side window which looks right into our back garden. So how come that was allowed but we can't have a window?!
Could it be down to never ending cost cutting or something else?