years ago i read that the reason for the lopsidedness of the cursor was because of the old crt monitors. it just looked better having two edges being 'straight'; one exactly vertical up and down, one exactly horizontal, left to right; as those edges would have no 'jaggies'

rotating the pointer straight-up makes it look even more off-kilter.
https://files.catbox.moe/1dhu8r.png