I just bought Metroid : Other M for $13 Brand New

Well, you do kind of have to think outside the box with some of them. The Varia suit has no logical explanation for not being used with the exception of making the game more difficult.

Speed booster - It could theoretically make you hit a specific part of the ship or something and destroy or damage something vital or it could send off a frequency that makes the creatures more aggressive or attract them to a single point, causing an unneeded situation.

Grapple Beam - There's not much reason for this being locked with the exception that it restricted you from getting places too early.

Power Bomb - Adam states this reason. If it explodes, it could get another life form caught in its radius.

Wave Beam - If you shot through an object and someone was on the other side without you knowing, hello unnecessary casualty (even though it states in the game you can only shoot through transparent or semi-transparent objects).



Some of these things can have good reasons, some are just kind of... pointless.

"It could theoretically" -- Saying something like this means you had to invent a reason why an irrationality happened. In a well-told story, you shouldn't have to. His already poor reasoning makes even less sense when he tells her to use those things later in the game. I guess the wildlife or potential people/soldiers in the neighboring rooms suddenly stop mattering to him at a specific point in the game. On this point, the writer either was being outright lazy, or is a very bad writer.