All the more reason for your OS to use memory aggressively. Surely you don't want your expensive investment sitting around just doing nothing?

Unused memory is wasted memory.

The prefetched data is managed by the OS. If a program needs the RAM, the prefetched data is immediately discarded. Prefetching never creates RAM pressure.

This. It blows my mind how many people who write software don't understand how OS caching and virtual memory work. They are great filter interview questions ;)