My sinuses have been achy and throbbing for the last week. I hate not feeling 100% and was thinking from an anatomical perspective, sinuses don’t make sense. So, because it’s how I roll, I googled “What purpose do the sinuses serve?” Answer:
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A variety of theories have been proposed:

• The sinuses act as ‘air-conditioners;’ they filter and humidify the air.

• The sinuses lighten the weight of the skull.
• The sinuses are ‘crumple zones.’ In severe facial trauma, the facial skeleton is crushed; this absorbs energy that would otherwise be transmitted to the cranial cavity and brain. In a similar fashion, automobiles are designed so that the energy from a collision is absorbed by the car body, but the energy transmitted to the passenger cabin is minimized.
• The sinuses are resonance chambers (echo chambers tuned to a specific frequency), which change the characteristics of spoken voice.

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I still don’t think they make a lot of sense and would prefer not to have such a frequent point of failure in my life. Not that eliminating them is an option.

Source: American Rhinologic Society (No, they don’t study rhinoceri.)