Harder to hear yes, just because it's harder to hear that high anyway. But also keep in mind that when spacing is too large for perfect wave integration at the radiating plane the waves will integrate at some point further out. That can be very problematic in the midrange, but if you're dealing with wavelengths that are only a few inches long or less then even a ten wavelength lobing depth isn't going to be audible at normal listening distances. As long as it sounds good theoretical perfection isn't a requirement.