Just a perfect example is DTW 777. All the flights are scheduled for departure within 1 hour of each other. So why would you need a 24 hour SC window.
PS: I think grouping departures together is a good idea operationally and for QOL for reserves.
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Here's an example of how 24 SC bit me and why the company might want it. Everyone has pushed the group is out the door and one hour after I checked into a hotel I get a call from scheduling saying your going across the pond. How, someone diverted and the reserve guys got to pick it up after being on call for 14 hours and then fly across the pond.
I love 24 SC!!!