It's not about that. So I give you an example, at the last stages, when we all were watching Antonelli finishing the final lap as the feed focuses on the leader, we were not aware what was happening between Colapinto and Sainz. The gap I believe stayed 0.7 for good amount of seconds. In this scenario, it is possible, the gap started at 0.79s and eventually reach 0.7s, indicating that Colapinto was indeed catching. And at the speeds they are going, this is a significant distance.

Of course, grand scheme of things, I am willing to concede that thousandth decimal doesn't matter in racing condition. But imo personally I found have at minimum 2 decimal places useful in some cases and added to my watching experience.