The mechanic of the dragon in 6.9 in this patch should be changed

In patch 6.9, Riot changed the mechanic of the dragon,the buff they changed is really good but the problem is that they randomized the dragon. I think this “random" mechanic is not fit to the league because most of the random mechanic has been changed in the past patches. random these four type of elemental dragons is quite unbalance sometimes because if the team wants to play aggressive, the infernal dragon is the best for them and if the team likes to be defensive the ocean drag is the best but random dragon will make these strategies unsuccessful. so I think we don't need to change the buff but the mechanic is pretty important. One of the mechanics I think is that we can change the mechanic pretty similar to the mechanic of Rift Herald. After killing the Dragon , an "elemental shard" will drop for the team that kills the dragon. and once one of the team member take the shard and can pick one of the buff for the entire team or make a voting system. This can be a way to solve this "random" problem, maybe it's not the best way but solve this problem is necessary.