Well on 1 account I got top 25% in both CGs, still waiting for my combat FSD reward.
On a 2nd account I got top 25% in trade.
On my other accounts I didn't take part, as with the amount of effort needed to get top 25% the effort was too much.
Now with Fdev lowering the bar to top 75%, yes I'll admit I'm a little peeved. If I had known this beforehand I would have popped the others out, spread the load and likely would have got one on all accounts. The change is enough to make me grumble, but as more of a nice surprise to those who did try to grind to 25% nothing more than that and I'll consider them lucky.
If they give them to everybody though, I'd become annoyed. Yes my other accounts will get them, but what a complete waste of effort it becomes. I would also want to know where my missile launcher is for the earlier CG I decided not to take part in. If they gave those who took part an extra FSD on top of those they actually earned it would be better, but still, why should a person who hasn't even logged into the game for a year or never takes part in a CG get the reward? Also why shouldn't the people who got 25% get 3 then?
As for game balance, well that's easy, all they have to do is offer the same item again in a future CG, and people will decide then if they want to work for the reward, It may be a while (just like discount fed/Imp ships and access to them changes at times), but I'm sure they will offer it again in future and we all have the option to try and get it, or not, when that happens.