League of Legends as an esport has historically and even today (with the exception of SC2 now) been the most regionalized game ever. Most years they get 1-2 international competitions and whatever few IEMs happen to be hosted. Even among those 1-2 international competitions, there were years where one of them was a joke like All-stars (which is a fun event, but can’t be taken seriously at all. As far as I know, only LoL take it seriously since they are so starved for international competition).
This has multiple effects on analysis, team evaluation, player exhaustion and so on, but for now I’ll focus on the overreaction to group stages. The essential problem with having so few international tournaments is that an entire team’s legacy and how they’re remembered by the general public is decided by one event. This is because regional success is only cared about within a certain hemisphere. The West only cares about EU and NA. The East only cares about LCK, LPL and LMS. The fans don’t meet up until Worlds starts and Worlds is the only tournament with a big pool of teams in attendance. Thus is becomes the be all, end all for fans to rank teams in the grand global ranking, which is why they overreact to every win or loss.
The best way to know how good a team or player is to have a large sample size of their competitive games in multiple LANs. This happens in every other game I follow: Melee, Street Fighter, Dota2, CS:GO, SC2 (prior to this year). I mostly just feel sad for the hardcore fans of the games and the players who miss out on what I think is the best part of esports competition. In a better world, they could have had the LCS and multiple international competitions a year rather than just Worlds/MSI + whatever IEMs happen.