Flexibility is good, and you also always get to surveil 1 on ETB, too
Each land enters the battlefield untapped and produces a primary color for the Esper shard
They probably wanted to show Nintendo that they have a strong plan AND some serious Pokmon TCG fans who can help provide artwork already lined up (on top of their usual art staff from Magic the Gathering)
In the first Commander product, it signaled that our friends in Studio X (called R&D at the time) were not just willing to design with the format in mind, but specifically targeting parts of the game which meant something only to us
You can produce a 4-color identity for your deck with pairings like these examples: Red, white, black, and green with Akiri, Line-Slinger + Reyhan, Last of the Abzan White, blue, black, and green + = Ishai, Ojutai Dragonspeaker + Ikra Shidiqi, the Usurper #16
Illustrated by Leonardo Santanna