Here in Sweden where collective bargaining is widespread I haven't found that it's somehow in conflict with individual bargaining. Collective bargaining results in minimums, like this is the worst deal we can give you based on collective agreement. You can still bargain individually to get a better deal than that.

It can perhaps be an issue if you feel that you can be more attractive on the market by undercutting the competition, but I'd guess that the majority of game developers are not in that position.