Toilet seats in public restroom are open in the front because it makes them easier to clean.
Why didn’t this U-shaped trend catch on in home bathrooms?
Probably because it reminds people of public restrooms, which is not a pleasant image for a private powder room.
Before the introduction of modern flush toilets, most human waste disposal took place outdoors in outhouses or latrines.
The toilet did not become popular until the late nineteenth century, when it was adopted in the upper class English.