The meditation that Buddha taught is vastly different than the modern ones. He let his disciples sit when they had nothing to do. What he guided them to practice is not to do with breath, nor concentration, nor compassion. But much more concretely, he taught to try to pursue and then confirm the reality of what you've heard, and that you should only allow yourself to accept the reality once you've confirmed. Confirmation is essential because people can easily deceive themselves when they misunderstand something.

If there's anyone who opened eyes to reality through meditation, you should ask them concrete questions about things in the reality to verify. They probably have understood the term reality as one experience, state, or object, which is the indication that they are being deceived by someone/something. You'll have to verify case-by-case to be sure.

Reality can be defined as the set of results which are determined to appear from the problems that things in the world have. Because these results are determined in a fixed principle, someone who knows Buddha's teaching can easily recognize an discuss any field of study at length without difficulty, even if they've never studied it before, because they can realize how it works and thus recognize the problems (matters) involved in the field through the person they're talking to.

Hope this helps. Ask any questions if I can clarify something