No one outside your union can tell you specifically how or why they bargained a certain way. You should get involved more with your union and ask them these questions instead of posting here. Every union is different and they're obligated to explain these things to any member who asks. If any of it discourages you, then it is up to you to educate other members on why you think that's wrong and help get them organized for the next round of bargaining. A union is only as good as its active members.
If your Canadian union isn't working for you and the above doesn't help, then you file a DFR report with the labour board. Even mentioning DFR (duty of fair representation) should get you service if the union is being adversarial.
Please sell it to EA. Sell all the garbage game making companies to the undisputed king of shit so I can have an easier time avoiding shitty games.