No. The RR stem should suit riders around 5’4” and taller. Shorter riders have a bike with a rear end that is relatively long, so they need an even higher relative front end height for more leverage to maneuver the bike. Tall riders have a bike with a relatively short rear end, so they don’t need as much leverage, but they do need a better rider position. I, standing at 5’8”, designed the stem for me to ride harder and faster, with more control. The RR stems height can also be fine-tuned by running spacers above or below the steerer tube clamp, and riders can still use bar rise to match to their height. You should be able to find a height that works for you and your bike perfectly.