Mike Robbins argues against over-capitalization:
In technical writing, letter case affects more than style. It influences tone, readability, and accessibility. Typing in ALL CAPITAL LETTERS might seem like an easy way to add emphasis or style, but it often does more harm than good, affecting how quickly readers process information and how your message is perceived.
If you want your message to be clear, approachable, and accessible, avoiding all caps is usually the best approach.
Read on for the reasons why.