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Masses of water moving around are really powerful. They toss around and break human bodies. As a mediocre surfer, I imagine it would be quite difficult to deploy an emergency air system while being tossed around by a wave, and that a permanent breathing tube would need a pretty hefty retention system to keep it from getting knocked off or damaged.

Some big wave surfers do. Apparently it's pretty disconcerting, as you need to let go of the air you're holding before taking a big breath on the device, which may or may not work...

99% of Scuba divers don't carry spare air. It is hard to imagine it being worth it for surfers.

When you get really drilled by a large wave, you get ragdolled. Getting to an air supply could be hard.