I imagine logistics and cost are a component
The networks spend a ridiculous amount of money to manage the broadcast, from cameras, to setup, to processing.
Duplicating all of that just for the league could be seen as duplicate effort.
There could even be straight up logistical issues. How do you double he number of cameras? And wires? And cables?
“A typical regular season NFL game uses 12 to 20 cameras, but this number increases significantly for primetime games and special events like the Super Bowl, which can use over 100 cameras”
I get the point, I do, but this is the first time I’ve recalled this coming to light.