My preferred made up statistic is balls faced per match. Shows the genuine test match players
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Seriously, that has value, but doesn't really tell us in isolation how well someone is actually scoring, though. You could just be eating up balls struggling to get it off the square.
Removing not outs from the equation and working out what someone
really averages each innings gives us a clearer picture of someone's abilities, and removes false hype and exaggeration and small sample size theatre, eg. Adam Voges really averaged 47.90 runs per innings, rather than the 61.87 "traditional" not-out-boosted average.
I don't think it should replace the traditional average metric, but I think it should become a more readily available (without having to calculate it yourself, out of your own curiosity and interest) stat, along with balls faced per innings, and balls per boundary (in all formats).