I've been using the two different RRs (2 different sizes) for years to level out my dirt and some small patches of gravel.
I some times go forward into a high spot of clay dirt with lower teeth, fel locked and knock the top off and then back drag on float or locked with lower teeth to final level. Locked can peel a bit more off if needed and float will level to finished grade better.
I some times change angle of lower teeth, fel locked and back drag to cut more down and some times stop and dig with front or/and lower teeth by just angling the teeth and working the bottom of the bucket back and forth with FEL lever and tractor not moving.
I use the lower teeth most of the time but the front teeth can be used for various purposes, not just weed/brush removal. The RR is strong and is mostly limited by weight of tractor and strength of fel. Sure the Pirinha has the same limitations and is very strong.