It's not a need, it's a reward. You want to incentivize trying, which is a problem in baseball right now. The difference between being the #2 seed and the # 5 seed can literally be the division you play in. How does a 1 fame lead incentivize trying in that scenario, which happens nearly every year? I'm not advocating the 1 game lead thing. I think 1 game play ins for WC teams are the best option. The point is to make a strong team in a though division not just settle for a WC, and also giving contenders a reason to try for more than just getting in with 85 wins. At the bare minimum, you want to host that WC play in game if for nothing else, the revenue, but also the excitement you give your hometown fans and slight advantage in winning. Same with better record team hosting playoff rounds.