The problem with the changed forcefields is that they could turn out invisible under a lot of circumstances. I agree that they looked much better when they worked though.
The way they looked before reverting back to the blue shields really increased the immersion.
Never liked the blue shields as the design is shouting at you - "By the way I'm the SHIELDS!!!!!'. Kind of lacks that subtley that the change was looking to bring.
Anyway reverting back is very understandable. If they're invisible for a lot of cases then that would lead to player frustration. Something to definitely avoid.