I think everyone has their own eye for proportions… Some like to exaggerate the toe length, toespingm or have more narrow collar or higher collar line. Truth be told, unless very off, I think it’s a matter of preference.
When teaching footwear design, I always pushed accurate(ish) proportion, but also showed a series of sketch overlays of from a variety of designers including my own, Michael’s, and a bunch of other footwear pros just to show that there is also some variety and variation…
I’d agree the other details for the sake of speed on the Illustrator art are more an issue and fit with the finished look of the render.
R