all the passing rules were put into place for the reason you assumed...there was a significant advantage to the offense...the way it is now, the advantage is, all things being equal, the offense still has the advantage but it is much closer than when there was no time limit, stopped ball passing was legal, no limits on bouncing the ball off the wall, or using one man to pass...only exception is passing 2 to 5 and you can see the advantage when someone is good with this and they have no limits on bouncing the ball off the wall
and the snake is as stoppable as any other shot...again, all things being equal, it is a 50 50 battle when equal offense meets equal defense