One of the main purposes of a tractor, compared to other farm vehicles, is that it has a power take-off [0] to enable the engine to drive other farm implements like combines.
When we got a mower we went with a flail mower because we'd be mowing near neighbors and a bush hog(giant lawnmower blade style mower) will happily pick up a rock and send it with enough force to easily kill someone at a good distance. Flails tend to throw less things(which is why highway maintenance use them for mowing along the road).
Fortunately overrunning clutch attachments are cheap to add.