Office chairs serve a lot of purposes. Fully adjustable task chairs are the best in my opinion. Not only the ability to adjust the height, but also the angle of the lumbar and, my favorite adjustment: the tilt of the seatpan. Tilting the seat ever so slightly forward keeps pressure off of the back of legs while doing “tasks”. For me, arm rests are not helpful and sometimes just bang up against the table. Lots of chairs seem designed for tipping all the way backwards, for those who like their feet on the desk I imagine. While sewing, I lean forward just a bit, so the seat tilt adjustment is helpful.
To keep a chair looking like new, leather or faux leather can’t be beaten. Nothing (thread, lint, dog or cat hair) clings to leather and it wipes off with ease. The upholstery of every office chair I’ve owned over the years was an awful lint and thread magnet and, with it never comes off easily.