The problem is when the logo serves some other purpose, like on HN where it takes you back to the home page, and that's not uncommon. Alt text describing what t

The problem is when the logo serves some other purpose, like on HN where it takes you back to the home page, and that's not uncommon. Alt text describing what the image is isn't all that useful to a blind user, but text describing what the link does may well be. Yet many of the examples you see online just suggest adding "Company logo" as the Alt text, or even "Company logo that's a stylised letter Y contained by a square border". No screen-reader user wants to hear that every time they navigate to a new page!