Punctuations play important roles to convey what one really wanted to say. They also help the reader understand what the writer's telling. Can you imaging groups and groups of words without periods, commas and other punctions?
In my job where I edit transcripts of depositions and other legal proceedings from US of A, the mastery of punctionations is very crucial to have a good transcript. Even to the simpliest thing such as when to hyphenate a two word to make it an adjective is important. Dashes, semicolons, commas, quotation marks, all punctuations are very helpful. They can create drama, actions, adventure, and most of all, they give beauty to your write ups. Ooppps! write up is not hypenated.