Personally, I don't like plain captoes. I do like adelaides - either semi brogues or austerity brogue adelaides. The U throat just does something for me. I do have a plain captoe balmoral boot, but it's with a suede shaft, so it's not exactly boring. I also have a captoe in black, but it's a quarter brogue or punch cap, so it's not totally plain.
Everyone likes something different. That's why there are so many choices in shoes.