I live on a new build estate. All houses look pretty much the same and the front of houses are close to the pavement so it’s hard not to glance in when walking by as most houses have a large three pane upvc window. Most people have installed blinds or shutters to the front windows. We had plantation shutters fitted when we moved in. Three sections and they line up with the 3 window panes. The people across the road have just installed the same shutters, upstairs and downstairs, but they all have 4 panels. From the outside it really bothers me that the panels don’t line up with the windows.
YABU - non of your business, keep walking by and stop being nosy
YANBU - what were they thinking, where is their symmetry