It is very important for people who are sanding or working with wood products to not inhale that directly, and instead take proper precautions. When you say wood products, I’m assuming you mean that in its raw form versus a finished table, which will not carry such a warning.

The lesson isn’t that their ubiquity doesn’t mean they’re useless; it’s that as a society we’ve allowed too much toxicity into our lives. I don’t know what percent of prop 65 warnings are for things like wood where it’s about the dust, but I do wish the warnings were improved to give specific actionable information. Like “hey wood dust shouldn’t get into your lungs. Make sure to wear a mask with certification X to prevent that”.