We've always treaded carefully around privacy concerns as a project. This is why you don't see tables that access information such as browser history. If you join our Slack channels you will see open discussion of privacy implications for changes and improvements.
There's a balance to be struck between visibility and privacy. If a security team has no visibility into a system, they can't secure that system. This doesn't mean they need to be able to look at your family photos and read your messages.
I work with folks who care deeply about privacy and trust with their users. These folks ensure that osquery configurations are available to users, so that they can see what exactly is being monitored.
If you are curious what osquery can do, I encourage you to check out https://osquery.io/schema/4.3.0/.