As many folks have said in many ways, the perfect is the enemy of the good. Its easy to look at something new and spot its flaws and cast it aside because of them, but if there is a perfect solution for Commander matchmaking, no one has yet discovered it in over twenty years
Almost all trading card games (or TCGs) reach a point where they need to rotate cards out of legality for use in organized play
In fact, this is the one format where having a strong deck (at least one that appears strong on the surface) can work against you
Rosewater mentions that MTG designers tend to rank mechanics in a spectrum that goes from splash to workhorse, with splash being mechanics that most players recognize as new (and hopefully exciting), while workhorse are mechanics that are more low-key but nevertheless essential for a set to work
While rather unassuming on its front face, Emet-Selch eventually transforms into a permanent version of Yawgmoth's Will on its rear face