If you are a "lone wolf" then certainly you only need to know "actual results", any type of other affiliations such as small or large teams (or a professional, IMO) would be foolish to not track the results for a myriad of valid reasons.
It may be impossible to track every hand but it is not impossible to have a tracing protocol and systems that is accurate enough to make comparisons of your sessions results to model's like cvdata and cvcx.
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