How have recent NHL developments shaped the game we watch today? This tier list dives into the impact of significant changes, from the thrilling expansion of the Vegas Golden Knights and Seattle Kraken, to the strategic adjustments like 3-on-3 overtime and the introduction of the coach's challenge. We'll also examine the evolving landscape with jersey ads, digital board ads, and the growing spectacle of outdoor games. From the fundamental playoff format to the divisive hybrid icing and the hotly debated 4 Nations Face-off, discover which innovations have elevated the league and which have fallen flat. Rank the changes that have truly defined the modern NHL.