Not all users have access to update their plugins. Announcements like this one on WPTavern are crucial for developers to know that there's an issue so that they can update client sites and to share the word with others. For example, I just upgraded my cousin's bbPress plugin on his site because he doesn't have access to do so. Without this post, I wouldn't even have known that there was an issue because I don't personally use bbPress.

A lot of people don't upgrade every single time either. Spreading this info may help get the info onto their radar that they need to upgrade.

There are many people in situations where posts like these are extremely helpful.