Imagine a world which is almost flat (but hilly), really big, and with a transparent atmosphere. We had extremely good telescopes, so from a big hill we could o

Imagine a world which is almost flat (but hilly), really big, and with a transparent atmosphere. We had extremely good telescopes, so from a big hill we could observe people a few thousands of km away, but we could only move very slowly. In the distance, there was another civilization that didn't have the technology to see us, or any other way to communicate with us. We also didn't have lasers or any other tech to send messages to them, other than travelling there (which would take some years), but we could see what was going there in almost real time. Wouldn't the same still apply, even without the limitations of the speed of light?