Obviously, if you are buying an office chair for a specific person who will use it for a specific type of job at a specific desk, being able to adjust it is not as important as when you are buying one that will be used by more than one person for a variety of tasks over a period of time.
Modern office chairs often offer a variety of adjustment mechanisms, including movable lumbar support, tilt tension adjustment, and tilt angle control.
Furthermore, a swivel chair that is fitted with casters enables you to move effortlessly from one part of your desk to another. The same is true if you have a printer or other piece of modern electronic apparatus that’s not on the desk, and you often want to easily access it without having to get up all the time.