Probably partly because the writing system is oriented for right-handers. You’d have the entire section of the desk under the page providing support whereas for a left hander in a right-handed desk (especially the ones with comically small writing surfaces) your hand is literally hanging off the edge, especially when writing a bulleted list or shorthand notes. We also have to raise our writing hands a bit when writing to avoid smearing which further hurts ergonomics
Honestly i used a left handed desk as a right handed person once and it was fine.
Probably partly because the writing system is oriented for right-handers. You’d have the entire section of the desk under the page providing support whereas for a left hander in a right-handed desk (especially the ones with comically small writing surfaces) your hand is literally hanging off the edge, especially when writing a bulleted list or shorthand notes. We also have to raise our writing hands a bit when writing to avoid smearing which further hurts ergonomics