^^ right.
the newer hogs all have that floating top link which allows it to pivot while still having fairly rigid bars running to the back.
this older style Kubota ... the "tree" stays put on the 3 point & the deck itself still pivots on the lower 2 mounting bolts of the 3 point & the cable that runs from the 3 point to the mount on that tail.
it was factory made this way, before those new style floating top links came out. achieves the same result. You will see a lot of guys here & on the net who have rough terrain undo the bars & run a chain to the back. YES sometimes this can be dangerous if it were to "flip" up at you.
for people with flat ground? probably doesnt matter. for people like me who are constantly mowing steep inclines/declines & do a lot of that backwards?
its a big help in getting a good cut without bending & breaking the mount or brackets back there.
do want a front roller though to get that front edge up/over things. This is mainly because im cutting way shorter than most people like to do with a hog. most people are just getting things knocked down or manageable height..... my hogging on my trails is down to almost dirt level everywhere.
scalping & leveling it all at the same time.