Underreckoning in a sentence as a noun

For starters, I think you’re underreckoning how many things look platform-native on Windows. To be sure, increasingly many things forsake it, primarily software using web tech to render, but there’s still a lot out there that’s fully native look-and-feel.

Underreckoning definitions

noun

an estimation that is too low; an estimate that is less than the true or actual value

See also: underestimate underestimation underrating