There were many shown at CES in January. They probably just haven't made it to full production yet.
In general, though, a curved screen is best for people sitting along the centerline -- e.g. for individuals with high-end gaming rigs. The image will be significantly distorted at the nearest side if you're sitting off-center.
Samsung doesn't seem to think it's a flop and is doubling down this year as indicated above (apparently based on some conducted research). AFAIC, the curve is form over function at these sizes unless you're the lone viewer.
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