Goodbye FLoC, hello Topics

On the contrary: an auto mechanic on a recipes page is more likely to already have all the job tools he needs and more unlikely to have the cooking tools.

Auto mechanics use a lot of specialty tools that very few other people will ever know about, let alone use. They are also more likely to already have sources for new tools and not likely to respond to ads for new sources. They are also not likely to google for how to repair pages in the ordinary course of business.

Or to put it another way: the people most likely to google for how to repair pages are the amateurs who don't already have a vast collection of repair tools, not the professionals who do have that vast collection. Similarly, the people most likely to google for recipes are the amateur cooks who might be interested in new pots and pans and implements of cooking, not the professional chefs who already have almost everything they need, and if they do buy something new, it will be from a friend's and/or colleague's recommendation.