Deere seems to have that problem figured out, and when other tractors have hydro and the L/R brake pedals on the same side, they are indeed useless. Maybe it is a patent thing. But while I don't have a need to use the L/R brakes very often, when they are needed THEY ARE NEEDED.
4wd takes away a lot of situations where the left or right rear wheels don't need to be brake'd (stopped), but when one wheel loses traction it can be very helpful to be able to apply the brake to that wheel and force traction from the other one.
Clearly a design fault to me, when they are on the side of the forward reverse pedals.
Thanks to Deere, on this one.