The group images section is underappreciated - the star rating example is exactly the kind of thing that gets implemented wrong at scale because developers treat each image independently rather than thinking about what the group communicates as a unit.
One thing worth adding to the real-world picture: the gap between knowing these best practices and implementing them consistently across client work is where agencies actually struggle. A developer reading this article will understand alt text correctly. But an agency delivering 15 Shopify stores a year with 200 product images each is dealing with a volume problem, not a knowledge problem. Writing contextually accurate, properly structured alt text for 3,000 images annually is where the process breaks down and gets skipped - which is exactly what ADA automated scanners flag first.
The point about social media platforms offering alt text on upload is interesting too — most content managers don't know that option exists. It's buried in every platform's UI