My motorized adjustable desk and highly adjustable Capisco chair work for both me (6'2") and my wife (5'3") at standard-office-chair height, tall saddle-stool height, or standing. It can easily be slightly tweaked for typing or writing with a pen.

If we wanted to do the same thing with a fixed desk, we would need some kind of platform for her to stand on, plus at least two adjustable-height seats with adjustable foot rests.