Look, tennis is more than just topspin. But everyone who has played tennis before should know that topspin has massive benefits. Crudely summarising it, it gives you more consistency. Do not try and tie 'topspin' with player quality. They are totally irrelevant. In a tennis match, the better player wins. Even though their technique is different or even incorrect, it doesn't matter much. Topspin vs Flat, Serve and volleyer vs Baseliner DOESNT MATTER. The better player is the player who can get the right points at the right time. It doesnt matter what they did to get those points. Tennis is one of the few sports where you can still lose even though you have more points than the other player. If you cant see the benefit of killer topspin just look at the ATP.