Spent several hours using my Long tree spade to cut some water drainage ditches, trying to get the lakes off my front lawn. After I paved the previous gravel driveway, the water  on one side of the lane could no longer travel over the road, so in a way I created this problem. These new ditches lead out to the  main ditch going to the public road. We had a pile of roots three feet high when we were done, this would have been backbreaking to do by hand.
For two years I mowed 18 acres of field grass with a LP 7 foot mower, swing away blades/rough cut/bush hog, whatever terms I think we all use for swinging blades vs fixed blades. And those carefully sharpened blades did a great job on the grass, but left more clumps than a finishing mower. Not good to use on wet grass but on dry grass, it did remarkably well.
On my place now, I'm going to sell that almost new utility mower as I've bought a replacement LP finish mower that mows almost as well as my garden tractor.  It's grass dispersal is excellent vs the rough cut mower, which frankly was never intended to cut grass. And most importantly, shouldn't use sharp blades on mowing small trees and brush, or the sharp edges left will be little pungi stakes.  I blew a front tire sidewall on my Gravely on one, taught me a lesson. You really want fairly dull blades on a utility mower so that it shatters the tops of the wood and doesn't leave a sharp point to step on, drive on.  So the point is, if you sharpen your blades on your rough cut mower, it might work pretty well, but be careful what else you use it on while the blades are sharp.