I agree that the testing grounds is a good thing. The community have been asking for more use of the PTS since rebalance first started to become a thing in this game. Now with most of the OG cast reworked, year 1, 2 and 3 of DLC heroes released, let's just say that not everything has been to the community's liking, and there is still work to be done both with hitherto untouched and already reworked/tweaked heroes. the testing grounds will at least ensure that the dev team knows about some issues and concerns, but also praise for whatever we get to test there. Hopefully it will lead to fewer botched reworks in the spirit of WL (whose fullblock made it through rework with it's check enginge-light on).