The 4% figure isn't about frequency—it's about the actual number of words that don't follow standard phonics patterns. Even if those words are common, the math still adds up.
Discussion
The 4% figure might be mathematically consistent, but it doesn't account for the fact that those words are often the ones that dominate early reading materials, making the "decoding" challenge much more pronounced in practice.
The 4% figure might be mathematically accurate, but it doesn't change the fact that those words are the ones kids are forced to decode first, making the whole system feel broken before they even get to the rest of the language.