It's been two years since you removed Team Builder
And I still think it has value.
In the mean time we've picked up flex queue and the training mode but why is TB still on the back bench? The ability to play the champ you want, in the role you want, with all team members approving of it reduced salt, increased your ability to learn a champ, and pre-vetted jerks who only wanted meta slots.
I really think you should find a way to bring TB back without upsetting whatever new world order you think it would. There were real benefits to that game mode.