Most technical writers are confused about grammar. On any day on the TECHWR-L list, basic questions are asked: "Is 'User's Guide' or 'Users' Guide' correct? Maybe 'Users Guide?'" "Should 'web' be capitalized when used to refer to the World Wide Web?" "Which is right: 'A FAQ' or 'an FAQ?'" Many of these questions become the major thread on the list for a day or two, generating far more debate than they're worth.
The confusion isn't so much about the grammatical points themselves. It's about the nature of grammar in general. Apparently, many tech writers do not see grammar as a set of conventions to help them write clearly. Instead, to judge by the wording of the questions and responses, they see grammar as a set of unchanging rules that can provide definitive answers in every situation.
Some are afraid to break the rules of grammar and risk being denounced as incompetent. A handful, smugly sure that they know the rules, use their rote learning of the rules as an ad hominem attack, nitpicking at typos and small errors to discredit writers without disproving their viewpoints. Most sit in the middle, haunted by the ghosts of childhood grammar classes until they can hardly tell on their own authority whether they are writing well or not. But underlying all these reactions is an attitude that rules are rules, and cannot be broken.
This attitude is usually known as a prescriptive approach to grammar.