Many people do not know how to play TT, I imagine the ones that read this will however know that if you cannot push the final tower killing the inhibitors is detrimental as your lane will constantly push giving them freefarm.
So smart people will not kill the inhibitors unless they can win the game at the same time. At some point you must of course push the base, at which point the enemy team knowing you will beat them in a teamfight will likely stay back while you kill the inhibitor as a necessity. Now you are forced to dive the final tower if you wish to kill it as the enemy team will simply pull the minions into the laser/ farm from the laser.
I have lost too many games playing against this 'tactic' If you have some form of adc you can kill it easier, but that is not usually the case. The point is that too many games of this sort are lost because you are forced to dive the final tower to kill at, at which point a teamfight brakes out and you often lose.
This is easily the biggest problem with TT. picking strong champs is annoying to play against if done en mass i.e Singed, WW, Rammus, Amumu, Malphite etc but that is fair. No one is stopping you from doing this if you wish. Pulling minions into the laser cannot be what Riot intended when making the map, minions are meant to push towers and finally the final structure. The idea you could be forced to dive a tower even though the lane is pushed to the tower is just simply dirty. It is essentially bug abuse, and if you do it you should be banned for life.
The real injustice comes from the fact while being better than players who use this tactic your skill is made largely irrelevant. As soon as you get close to victory teams just essentially stop playing the game. They stay in their base and prolong the game. One Team just runs around free farming while the other just waits in their base. It is a bad joke and that Riot has done nothing about it is a disgrace. Why make a game mode if you allow people to abuse a bug that destroys the mode.