Heels were originally invented for men. So why not.
Google:
However, men used to wear heels long before women started wearing them. High -heeled shoes were first worn by Persian soldiers in 10th century to elevate their feet, giving them stability while shooting their bows and arrows. Since then, men heels symbolise high social stature, military power and fashionable taste.
Nearly everyone has heels on their boots, itās normal. They should add heels to both male and female characters.
In FFXIV you can have heels on anyone. If you care about transmog Iād give it a try since they have a good trial. https://pbs.twimg.com/media/DeJLojvWkAEcJiv.jpg