Is Sarang a complete idiot?

[humanoid]

Imagine I snap my fingers and replace half of all your cells with an exact replica. I snap my fingers again and replace the rest. Did you die? Sarang would say no, for you are not your cells. You are the experience.

Yes but the problem I have with his reasoning is that you will never "experience" your copy and vice versa so why kill yourself if there will never be any conflict of both of you existing?