"My current glasses already work. Why would I switch?"
Mine worked too. They blocked the sun, stayed on my face, and looked like cycling glasses were supposed to look.
What I hadn't really thought about was how many small compromises I'd accepted as normal. Wind on fast descents. Glare. Sweat. Pressure behind the ears. Adjusting the frame. Feeling the glasses after a few hours.
None of those things seem important until the ride where they suddenly are.
That's what made SNDR interesting. Instead of treating cycling glasses like sunglasses with a sportier shape, the Sender Air was engineered around what cyclists actually deal with on the bike.