That's not necessarily true.
All of the PvP content in this game is still running on the same system. They have the same rules, and they use the same Duty Finder to divide teams. Yet, despite this, Feast and WD were programmed only to have 2 teams and much smaller numbers than Frontlines. Feast, in particular, also has a deviant programming for an 8v8 mode. On that note, ALL Frontline game modes are equipped with alternative 24 man versions. If I remember correctly, Secure also had a 48-man version back when it was first conceived, which was later removed. On top of that, the actual game mode itself was adjusted to reduce the number of capture points depending on team sizes. The only thing that has remained constant was the GC restrictions. That might seem unrelated at first, but the overall size of the match is part of the same system as how teams are divided. If they can make changes to one, then it's highly unlike that they can't make changes to the other. The fact that Feast actually goes out of its way to "balance" teams by dividing players by rank is further proof of this. It might be time consuming, annoying, and a bit of work, but it shouldn't be so hard that it justifies not doing it. It's their baby, after all. They should know it better than anyone.
Regardless, even if they do have some bizarre reason for why they couldn't do this (they lost he manual or something?), it doesn't make the OP's point any less valid. They have been consistently ignoring us for over a year now. Even if they couldn't retro-actively remove GC restrictions from previous Frontline game modes, there is absolutely NO reason for why they have continued to use the same, almost unanimously hated, system in each subsequent version. GC restrictions were a problem as early as Secure, yet they designed Slaughter, Seize, and Shatter to use the same framework. There's no excuse for that blatant disregard for our wishes. After all this time, the whole lot of them should prostrate themselves on stage at the next fan expo and beg our forgiveness, and even then, it wouldn't be enough to make amends for over a year of such shameful behavior.