Sneezing often means there’s an obstruction or at least an irritant. Since the nose is an important part of breathing, it means removing the obstruction as quickly as possible is very important and that’s what the sneeze is supposed to do: to quickly release enough pressure to remove the obstruction.
Bit related but this is also why throwing up is also so violent and comes in waves. If it came out as one giant stream with low pressure, it would suffocate you.
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