FALSE
Most colleges don't require writing, but you still may want to opt into the essay! Most competitive schools require the essay. If you aren't sure where you are applying, not taking the writing test could limit your options. A decent ACT writing score opens up a lot of doors, and definitely doesn't hurt your chances of getting into any school.
Each test-taker has different goals, strengths and target schools. Consider all of these factors while deciding whether or not you should take ACT writing!