It is 2019. Thousands of people are sitting in a tennis arena, watching Roger Federer and Raphael Nadal playing tennis. Neither the existence of Roger, Raphael, the tennis balls, nor the net changes if no one is there to observe it. It does not matter if it is thousands, one or none. Roger, Raphael, and the tennis balls exist. Sensation/perception, or the lack of it, is irrelevant to their existence.
In 2020, it is possible to a no-audience policy because of coronavirus.
The insistence upon the priority and significance of perceiving and being perceived is a distraction to the act of philosophy.
Warning: if you ask me who is doing the act of philosophy then you haven’t been paying attention.