I think if you allow 3 players to push in the back field (similar to the Texas shoout and DFW rules) then I believe FOB tackling would tilt the scales too much for offense. If the rules stipulate that the QB can't push then i believe FOB for the first 10 yards from the line of scrimmage is a good way to play.
The size of the board makes a big difference too. A wider board means more running lanes and hence I believe is probably better suited for any touch.
Lastly, the "audible" or "formation" rules make a big differnece too. For example the Texas shootout rules make stacking against a run a desperation move since the offense can audible the RBs out of their original formations with the defense only allowed to move only 1 player. If the rules dictated that the defense could adjust 1 for 1 on audibles, then they could easily stack against a running formation and I would think that a running play with any touch tackling would be very difficult.
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