I would argue that there’s also lots of professionals who don’t use or need those features. Not everyone is using photoshop for print work, which that link seems to mostly discuss. It is still true, though, and every time I try to switch away from photoshop I run into some niche missing feature I need that most people wouldn’t care about.
The comments are funny but if you read the article he just did it for the bit. Apparently he changed quite a bit over that time and regretted being an angry forum nerd, so he thought it would be funny to do one last post and abandon the account.