Brand new idea for Riot games

So bear with me I know this may sound kinda stupid at first but I do have a point. Basically from day one riot has struggled with balance issues. While it may not be as bad as some games it has been an issue, and bug issues as well (I know riot never really intended for Fizz's W to cancel out zeds ult even if zed ulted him b4 he used E; obviously they just overlooked that issue). It may be difficult to implement but it would be awesome if they made something like a separate server where players tested out new champions, patches, etc. before they were released to the public. For instance they could have worked out the rampant balance issues with assassin update before it went live. I'm not saying this is the end all be all answer for this issue but it could certainly help.