There has been the typical backlash by League of Legends fans whenever someone rates a Western player over a Korean player. Although I agree some of the ones you hear are ridiculous (I still don’t know in what world Bjergsen is better than Faker), but I don’t think it’s as clear cut as saying League Champions Korea is the best League, therefore every player is better.
This ignores the how the entire game works as it ignores teamwork, synergy, macro decision making, micro plays, etc. This becomes even more complicated by the fact that League has the worst international circuit of every major esport, making it even more difficult to compare and contrast players. This is even further exacerbated by the changes in patches. And it even gets worse by the fact that no matter how good a player is, if their team is trash, they could also look like trash depending on their role and how the team works. Then there is a final layer: the fact that we don’t know what the comms are.
I think it’s a similar idea to when fans rate teams based off of their playoffs performance or worlds. I’ve seen this sort of argument before in StarCraft 2. When sOs won Blizzcon in 2015, multiple people tried to rate him as the best player by far. In reality, he wasn’t even top five that year, arguably not even top five of Protoss players that year. Even in a single tournament, it’s hard to rate a team or player based off of how they did in the tournament. Take worlds 2014. Star Horn Royal Club took second place that year. But I’ve never heard anyone say they were a better team than Samsung Blue, even in that single tournament.