It is funny how many people don't actually seem to know what a crutch is.
A crutch is this thing that you stick under your arm and use to help you walk around.It is not uncommon for a person to use two, and it is usually only used by people with leg injuries.
In a video game the idea is the same. It doesn't mean an overpowered item, or ability. It is just something you lean heavily on in order to try and get by like everyone else.
This becomes a problem, if you never learn to live without it. Metaphorically shifting back to the real crutches...Imagine a person who's leg is healed an simply refuses to walk on it.
TLDR; Learn what words actually mean, and learn to walk again.
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No Land could literally be used as a crutch