My concern is cutting tall grass; the old garden tractor that I sometimes use can only handle grass up to a certain level and then the front "wall" of the deck holds it down below the blades and nothing gets cut. I had to buy a tractor & rotary cutter for when the grass gets that high. I should mention that this is wild grass and some sprouting stumps, along with a few rocks, but no real heavy brush (not any more.)
I have trimmed a bit off that wall on the garden tractor deck, and may trim a bit more, but I don't want to cut steel off the deck of a new or "newer" machine.
Sort of like this...