It's awful design decision. Now people will simply build T3 Fire orb and change it to for Shadow. Besides slowing game process it changes nothing, same with Breeding Grounds. It's especially funny to hear about design in this case, considering that players doesnt like afk waiting parts of gaming, so noone really want to wait to collect energy. Real game design wise decision would be to make SoW less powerful by making enemies more powerful. Or somehow differently instead of simple slowing game process with orb changing.
In community driven project players who were charged by community to make changes has no rights to make such gamechanging changes without completely open discussion, when everyone can interfere and take look how they came to their conclusions about such changes. Instead of this we got secret unanounced nerf, which wasnt mentioned anywhere, besides secret private talks. Just in good old tradition of secret Nether Warp nerf, which was stopped only because it was noticed by pro players. Most shame decision making process in modern BF story, formerly known as community driven project.
And what about Slit Storm - how it was supposed to be used with 5 seconds charging time? Only Slow units cannot avoid it. It could be good card, if it would slow units in the area for these 5 seconds, before applying final effect. T3 very nerfed version of T1 Nature Roots with additional Gravity Surge effect.