So are we just going to forget all the times Sand trapped up their gates to the brim and camped the entrance? The main reason Leaf or any other village does not want to push Sand's gate is because by the time you mapswitch and/or sub the traps you're dead meat due to the barrage of jutsu coming from the inside. If you're not certain of the traps / numbers Sand has while defending their village entrance it would take a complete madman to push that without considering the option of just heading home. Situations like these would be a whole different story if the villages would have multiple entrances as Leaf does. Hence Leaf is one of the easiest villages to push if we happen to hold gates, because people who did seals and unlocked the door to sewers just waltz on by and come popping out above us which is mostly a fight we can't win. Of course we could hold both sewers and the gate, but that also means splitting our numbers which usually ends up badly in case of a whole army raiding. Anyhow, bottom line is: Sand and Mist should have a second entrance in order to avoid situations like this and provide for more interesting gameplay.