Is baron too powerful?

I've had 3 games in ranked now where I'm far ahead of the enemy team and my allies are bad. I can carry the game, but at some point due to misplays on the part of allies the enemy team gets baron. At this point the game is over.

It honestly doesn't seem to matter how far you are ahead. A single misplay on Baron loses the game. In fact, Baron may as well just be the enemy nexus because its pretty rare you don't win after getting baron on 2 or 3 people.

I can understand the desire to make games "comebackable", but should one objective actually be that devastatingly powerful that it negates almost all preceding gameplay? The score could be 20-0 in the opponent's favor and if your team gets baron you have a very high chance of winning.

The issue is that the empowered minions are far too hard to kill and its completely uninteractive. You literally just push the minion wave and stand in it while the minions siege the tower. What's the counter play? You just take it up the ass and lose.

The obvious solution is to just not let the enemy team baron. Well its solo queue. If I'm the mid laner I can't control if my jungle is going to show up to contest baron. I can't control if my allies are going to show up. I can't control if anyone else is going to ward. Do I just lose because I random bad teammates regardless of how well I do?