Board Thread:Questions and Answers/@comment-31625365-20170329135349/@comment-26377724-20170331143200

OK several points:

Suzuha in apha attractor field doesn't know how to change attractor field for sure, in beta attractor field it wasn't daru's plan but Okabe's plan that's why she knows exactly what to do to reach her goal. In the Alpha, she jumped in the time machine with only a vague idea of how to accomplish her mission and she doesn't know exactly why the IBN is important (she even hadn't meet her father who prepared this mission) and she stopped by 2010 to try to see her father. Because she isn't supposed to be here, she is trying to avoid uncontrolled consequencies and only guide him with her avatar, john titor. And the IBN is far away of being useless, it's the key to access the SERN database to erase the first D-mail and change attractor field but Suzuha don't know that exact use of the IBN.

I think you have a misunderstand about the way the time works in S;G universe. What is troubling you is the predestination paradox, or in other words the retrocausality. In Steins;Gate this paradox is extended at his limit because the future  and the past are interlinked. If you change an event, like Suzuha go to past or not, the future, the past and the present is instantly reconstructed in accordance to this change. That's what happens when Suzuha go to the past from 2036, the simple fact to use the time machine made the divergence meter jump form 0.000000% to 0.337187%. It's also the same reason why Okabe at episode 23 take the time machine, because he saw it the 23 july, it's a stated fact that he try to save kurisu and it's pointless to resist, and if you try, everything will be reconstructed according to the fact that you don't go back in time or the attractor field convergence will force you to do it no matter what if it's a stated fact in this attractor field. Remember the death of mayuri is unpreventable, and in the same way you can't don't go back in time if it's a stated fact in this attractor field.

In other words the attractor field convergence is the central concept of the time travelling in Steins;Gate because it prevents the differents paradoxes emerging from causality and the only person who can change attractor field is Okabe because he is the only one who can have a full view of all the events in all worldlines, or like he said, he is an observer of the world.