Hypothetical stats:
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His current completion percentage is 67.1%. If every dropped ball had been caught, his completion percentage would be 74% which would be 4% better than any other starting QB (Brock Purdy at 70%) in the league.
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If the Chiefs had the average amount of dropped balls (11) instead of the most (26), Mahomes completion percentage would be 71% for best in the league.
So I think the only way these stats would matter much at all is if you calculated drops as a percentage of attempted passes for every team in the league and then used that average instead of the raw numbers. The Chiefs pass a lot. Then you’d have to adjust everyone’s stats toward the “expected” number of drops in order to compare them much at all.
Of course, this stat is a bit too subjective to be super relevant anyway lol