fuzzlewump- Technically, Umbran is talking about people's perception of their character's performance, not their character's actual performance. He's saying that your character changes so often that it mentally "resets" in your mind, causing you to feel like you have many small, insignificant samples of attack rolls instead of one large, significant sample that composes your character's entire career.
And I should probably note, I don't actually like CharOp.
I think they focus with monomaniacal zeal on single aspects of a character (like maximizing damage, or AC, but never balancing both), because that lets them make better comparisons. And while they're great with numbers, they tend to be not so great with words.
Occasionally that means its fun to poke at them, I had a good time pointing out to everyone that their allegedly objective, inarguable interpretation of the flight rules allowed for floating rhinoceri, but questionable rules interpretations do limit the usefulness of some of their work.
And I should probably note, I don't actually like CharOp.

Occasionally that means its fun to poke at them, I had a good time pointing out to everyone that their allegedly objective, inarguable interpretation of the flight rules allowed for floating rhinoceri, but questionable rules interpretations do limit the usefulness of some of their work.