The 3-d gray widget checkboxes writer uses within text documents are rather ugly
(they feel as primitive and broken as the original 3-d HTML table border style
no one would dare to use nowadays)

Competitors (Adobe Acrobat, Word) have been using nice flat 2-d B&W checkboxes
in document forms for years

It's a shame a trivial little thing like this ruins the overall OO.o modern feel