Strictly talking about breathing, the main purpose of your trachea is just being a tube to allow air into your lungs. The only thing creating a hole between your trachea and the air will change is that air will now skip everything above the trachea (e.g. mouth/nose filtering and conditioning, but also whatever blockages made the surgery important).
The only part of your body that is active when you breathe is your diaphragm, a muscle that is just above your stomach. You automatically move it when you breath in or out, and as long as most of your body is airtight that’s all that needs to happen.
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