"We made this new league system to make you nerds feel like you're in LCS"
Is basically what they said when they made the change. Discuss.
We decided to move to the new league system for a few reasons. For starters, having a single ladder with all ranked players doesn't provide a lot of incentive for advancement. When you’re ranked 290,000 and have 289,999 opponents left to pass on the way up, that process can seem meaningless and interminable. Tiers and divisions also provide milestones and manageable goals you can strive to achieve at your skill level. Through leagues we can move away from focusing on a single number as the core indicator of a player’s skill, and instead move toward something more compelling: competition on a small ladder with a relatable number of opponents.