I mean, it does though. Knowing how your colors will pan out def helps with world building bc it'll guide you as to what fits and what won't both with mechanics and flavor. Maro is acknowledging that Tarkir did the alternate take of Wedges first, and now Ikoria gives us the actual depiction of the Wedges, letting us see how the center color influences its enemies. Take Mardu: instead of crazy, ruthless nomads with a loose society, we get a tight-knit society working together for survival. This also helped shape the world with how the creature types got selected for each triome. Snapdax, Apex of the Hunt gets to be a Dino Cat Nightmare, since Red centered Dinos, White Cats, and Black Nightmares, where on Tarkir, they'd just be another dragon.
This is why I didn't like Creative's wedge portrayal on Tarkir focusing on the first color of the trios rather than the central color. Shard of Alara had the focus on the central color of the shards and things resonated well. It showed how the core color interacted with its allies, and a little bit for enemy pairings. For me, Tarkir always felt off due to going with the first color for flavor and focus. They played up more of the allied pairs than the enemy pairs. Now Ikoria is taking the Shards approach and using the central color of each wedge to get flavor and focus. This isn't a knock against Tarkir because I did enjoy that block and world, I did give me Crackling Doom. I'm just looking forward to the core colors interacting more with their enemy pairs, with a little bit of allies thrown in.