I'd think that the original Amiga arrow pointer could have got its stubby style because hardware sprite could only be in low resolution and 2:1-stepped lines did not look very good.
The style was changed to a sharper point in Amiga OS 2.0 but it was still slanted 45°. First on the Amiga 1200/4000 with AGA could you get a high-resolution mouse pointer.
In Workbench 2.0+ it was slanted 45° with the two sides at 30° and 60°, it was red with a hint of 3D (light at the top-right, dark bottom-left) and was beautiful! It stood out on whatever background.
The style was changed to a sharper point in Amiga OS 2.0 but it was still slanted 45°. First on the Amiga 1200/4000 with AGA could you get a high-resolution mouse pointer.