So in actual measurement, it really doesn't need to be considered. Instead of considering the error caused by light propagation time, it is better to consider more accurate timing tools.

Therefore, any research must consider practical problems, just as we also know that relativity is a more accurate theory of motion than classical mechanics. But when we calculate the speed of cars and the range of shells, we still use classical mechanics instead of relativity. Because when studying these problems, classical mechanics has enough accuracy, and there is no need to use relativity.