Like You said: We don’t know exactly what their goal is in balance changes. For sure huge impact on balance changes have pro players. But still I remember Viper who said that he was strongly against free loom for Goths, but they got it anyway.
IMO developers should make survey for proplayers ( example: top 100 players from 1v1 RM ladder ) and ask which civilization feels worse than others. 3 civilizations that were the most common choices should get buff in next patch.
And test them ofcourse.
Making one civilization that was bad or average, stupidly strong does not fix balance issues.
Sorry, I kinda exaggerated and reffered directly to March Patch Goths, but I wanted to show/tell that ( with Goth as a example ) that giving civilization a strong bonuses does not fixing bad, mediocre civilization, because it make civilization really strong and again need new balance changes. ( correct me if I’m wrong : in march Goths got loom and cheaper than right now militia ).
They already have a group of mainly pro players to listen to their opinion. Even Viper is part of that group. That doesnt mean all pros have to agree on a change.