To say that it is necessary to perform a process in order to experience it would seem to imply that the experiencing of the process is not included in the process.
This sounds a bit like dualism where the experiencer is apart form the process.
To say otherwise leads logically to the absurdity, as Egan shows, that an unperformed process is ‘pre-experienced’ and need not be performed.
I put this conundrum in the same category as whether an electron is a particle or wave.
Each has its explanatory power and each contributes to our ability to prosper in this strange world.
In either case there is, alas, no fact of the matter to be decided.
Some have learned which explanation to use in quantum mechanics.
I think we will learn which to use here too.
Tegmark brings a similar perspective.