macOS numbers formula range problem
As of version version 4.1.1 (4338), unfortunately with Numbers one can define the entire row, but not from a specific column forward.

So, while COUNTIF(I3:3, 0) will resolve to an error, COUNTIF(3:3, 0) will work regardless of the row's length. (Increasing columns)

Example:



This would be a good feature suggestion for Apple.