Reducing champion pool size is bad for the game.
In this season Riot has decided to reduce the champion pool so people will not be able to perform well if the other players share the same champions. One really bad thing about this that the RNG in this game is bad that it is hard to switch to another comp in the middle of the game as you can simply never find the champions you want for that comp from rerolling. In this situation you are left with 2 choices, the first one is to switch comp anyways and play with those lv1 champions and hope you can upgrade them to lv2 later in the game(in some cases many of your champions will stay lv1 even though no one else owns them). The other choice is to stick with the comp you are playing, which will rarely make you finish in a high place. The problem with TFT is that the game has became a highly luck dependent game. Your luck doesn't not only influence the champions you get but also the champions the other players get, if they happen to play the champions you are playing, too bad for you. This is an issue that skill can barely overcome.