DUDE, I didn't wrote the NFL champion list that without a reason.
Behind Colts and Broncos there was the same QB, the same for Ray Lewis as defensive mastermind into Ravens defense, the same for Rotlethlisberger behind Steelers win, etc...
Barring Buccaneers exception, it is around the same talent behind every victory, either ine of the selected elite QB or one of the selected defenses
And this is worth for every sport regardless of league structure.
NA LCS saw far less teams reaching the LCS Split Finals and reaching Worlds than EU LCS in the same period span with the same league system because the NA resident talent pool was much smaller and the teams that achieved success were the teams were those player went, which were basically every time the same and remained in the same teams (barring IMT, without counting the all Chinese LSPL caliber LMQ roster conquering NA before residench rule change)...and this happened despite NA LCS having far more money than EU LCS, because it was always a matter of talent first.
NA LCS doesn't look like will have new teams/talented in the top once we are seeing all the rosters coming together, and this will remain regardless of franchising as long as others teams aren't capable to snag new talents off those major teams.
EU LCS has had a system in place with promotion/relegation + a third tier of località competition that was capable to nurture talent and place multiple teams and players at the top of the standings, why should it imposed a system that destroys those strength rather than giving the resources to not make those rosters break/disband because a way richer team (NA or EU) come with more money and snag those players?
Franchising gives money to the team at the top at the cost of destroying third parties sources that can invest in the scene and breed talent, giving this duty upon major league organizations which primary goal is to win fast (especially in the current system where draft is nearly useless and you can't plan for "the process" because talents aren't tunneled throughout a single system to the scene, a bit like baseball is rather than basketball).
NA didn't have those third parties sources of talent so they needed to force franchising to shake up things in the long term and force teams to do it so.
EU just need money and exposure to get money for the teams on all the tiers in the ladder that were denied by Riot HQ so far because all the other systems were yet in place in the current system. EU teams are willing to stay with relegation from LCS as long as they get assured they can survive in Challenger scenes and that relegation isn't an immediate death blow, because is in their overall interest to keep alive a system that produces a stream of "cheap" talent.
Giants returned to LCS After stomping CS with a roster made basically by the All-Stars selection of the best player outside/ignored by LCS and CS (Jiizuke and Ruin best players from the losing finalist teams of EU CSQ Spring Split, Minitroupax best young and upcoming player of Iberic scene, Jactroll best available support that wasn't yet in CS/top contenders of major regional scenes)...a NA teams like build like that would have not made it to CS in first place or they would have finished below Delta Fox aka Meme Stream Dream Team