A lot of people here on the balance forum like to throw out the suggestion, stated like a requirement, that every single change be tested vigorously before implementation. There are a few ways to test changes, each with their own unique properties.
First, changes in the form of a mod. At most, this would allow 1 person, the change suggester and mod maker, to test the change. Nobody plays mods, nobody likes testing, and it's very easy to just lie and say "I tested it, this happened".
Second, changes with multi-person tests. These are hard to organize because nobody likes working for free are prone to sampling biases. Who's to say some new game-breaking imbalance doesn't exist with the new change that the small group of testers simply did not think of? Wouldn't it be awful if something got by them and ruined FA?
Third, making the change official. There's not really any way to definitively say how a change will impact the game and meta-game without actually putting the change in the game to try it out. Changes in FAF can be made fairly quickly and reverted just as easily. With no laborious publisher QA process to go through, it's actually really simple to change things or revert changes.
It seems like a lot of people are stuck in the mindset of begging GPG for one last patch, and are of the opinion that absolutely no bad changes must ever make it into the game because then they will be forever irreversible, like a scar on the visage, a permanent overpowered blight on FA's face. FAF is better than GPGnet, we can do better than GPG.