I'm sorry, Lost, but I have to disagree on at least 3 of those. Thorn was changed because 2-shot hand cannon from across the map is stupid. Plain and simple. Pulse rifles were nerfed because they were hands down the best choice in PvP no matter what you were doing. Sunbreakers were nerfed because their kill ratio was the highest. They were actually easier to deal with in Trials because it's easier for 3 to get away than 6, and Trials would have actually brought their ratio down since at most that's 3 kills, probably less, whereas in a 6v6 Titans routinely killed 3-5 with Hammers. I'm also going to preemptively disagree with you when they change snipers. They won't do it because of Trials, even though it is a problem there. They'll do it because it's the go-to choice in PvP for special weapons, because snipers can win in pretty much all conditions, and because sniping has no drawbacks.