I as well have never heard that one.
I wouldn’t, why bother? Nor do I want my memories tampered with. In your scenario, the person who went to that other world is effectively dead. Erased and replaced with an older version.
So? It matters when I’m alive.
However, I don’t think that experience, memories or anything else are “the meaning of life”. The concept of a meaning of life makes little sense. Words and other forms of communication have meaning; not people and worlds.
And if you are confusing meaning and purpose; in my opinion, the purpose of your life is whatever you choose.
Except the opposite is the truth. If you believe in God; or rather, base your “morality” on him, then anything is permissible. It’s not like he’s going to tell you that you are wrong. Lies, cheating, stealing, rape, torture, mass murder; all can be excused with a wave of the hand and “God wanted me to” if you base your “morality” on God. And the scare quotes are because I don’t consider a “morality” based on god to be morality at all.
And most would prefer that experience not be in prison, on the run, as a slave, or dead by a bullet before twenty. “It makes life better for everyone” is a perfectly sensible reason to behave morally; much more sensible than basing your morality on barbarian myths about an evil god. For among other reasons, it actually DOES make life better, instead of making it worse like religion.