Have already talked about the downfalls of this. It also doesn't encourage skill as as people will just cram the game tactics and just be sitting there with memorized line ups which is not possible with the current system because unless you have a maxed deck there is not best line up for a match. This also limit bot activity in modern which is different if you put back leagues. Each time i play a maxed deck with my unmaxed deck it serves as a reminder that i need to build my deck, that will also be gone if we put back leagues. There is absolutely no need to level up cards beyond my chosen league.