No, you are free to enable or disable it as you like. In fact, AI timing support is disabled by default, and it can only be enabled after you complete a short, anonymous and offline self assessment on your time management.
planimbAI was designed to offer a premier user experience even without AI timing support. The timing screen is still available on all of your projects and it displays an estimated number of days deviating from a well-balanced schedule based on your tracked progress, but not including a tailored AI assessment of your individual timing accuracy.