What happened to the rotating game types?

Riot has come up with a bunch of random game types that were unique, fun, and gave the players the chance to play league in a different way. They set up a rotating game mode queue so that we could play these game modes that they came up with and it seemed like the community was psyched they were doing this. So why did Riot take it away? My issue with the rotating queue was that the games didn't rotate often and there were still a bunch of game types that they've done in the past and didn't bring back into the queue. Is it too much of a strain to have this many game modes being played on the server? Was there too low of volume to justify offering these games? Lastly, I know a lot of people probably disagree with me on this, but why make TFT a permanent game type right away? Why wasn't this a seasonal game type like the others? I personally think TFT is extremely boring. The games take almost as long as a normal SR match and the involvement in the game is minimal. Instead of making Twisted Treeline better y'all decide to make a game type that will probably be dead within two seasons. If anything Nexus Blitz could have been the game type to replace Twisted Treeline.