They said the reason they were upscaling is because it would be very expensive to do the full production in 4K due to the use of stuff like super slo mo. Remember the golf isn't doing the whole event in 4K, they pick a few holes and don't need to worry about stuff like super slo mo which uses special cameras that aren't 4K (some of the fastest ones that capture stuff like the ball compressing against the clubface aren't even color)
I suppose there is little incentive for them to spend a ton of money to do 4K because it isn't going to increase the viewing audience or commercial rates. Nobody is watching an NFL game solely because it is in 4K.
Alot of people did watch because it was in 4k. Wayyy more. The Fox sports app crashed because of it and the complaint factor was up dramatically compared to other events. I would imagine once the ratings come out there will be a significant bump compared to other events.
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