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In TFT you do not have to do placements to go from one rank to another, or one division to another, meanwhile in Summoner's Rift, we still need to go through the awful and dreadful placement matches.

It's pretty absurd that TFT, a gamemode in beta has a better ranking system than the main gamemode of League.

Hopefully this means that they will implement this ranking system into Summoner's Rift

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almost 5 years ago - /u/MoreChrono - Direct link

Promotion series aren't perfect. Losing never feels good, losing a promotion game feels worse. However, for the most part, players like promotion series. What promotion series allow us to do is stuff like demotion protection (which TFT doesn't have) and they make the general feeling of ranking up feel like an accomplishment for games on Summoner's Rift. We are looking at ways to make them feel better, but there is no plan to get rid of them. TFT is a different type of game and so the ranking system was developed to reflect that.