That was the point of the example—by time 10, the charge was no longer accelerating, but you know that you’re not clear to use electrostatics being ‘noncausal’ yet because the light cone hasn’t reached that far. Being lag free is a computational convenience that sometimes applies, and you need to know when by applying causality.
So, it is ALWAYS fair to say that fields are causal influences, whether they’re static or dynamic. That was why I objected to your complaint in the first place.
That was the point of the example—by time 10, the charge was no longer accelerating, but you know that you’re not clear to use electrostatics being ‘noncausal’ yet because the light cone hasn’t reached that far. Being lag free is a computational convenience that sometimes applies, and you need to know when by applying causality.
So, it is ALWAYS fair to say that fields are causal influences, whether they’re static or dynamic. That was why I objected to your complaint in the first place.