I will try and sum up what they're saying, ONLY about Team Skywars. Chunk has nothing to do with Skywars at all, the merge did not affect skywars.
Team Skywars was merged with Skywars (Not Chunk) to make room for other games. Being a Team Skywars player myself, I think some of the community are frustrated because they enjoyed the uniqueness of their own community with Team Skywars. Lobby 1 was a place where the community would relax and have fun but now they can't all do that because it's always full. However this can be easily solved by choosing a different lobby to meet up in.
As for the gameplay, I think the most frustration comes from the removal of their most favoured and unique kits, such as the scout kit and the introduction of the abilities. I personally think it just feels strange having new abilities. Just the same as when abilities were incorporated into regular Skywars. But in time I am sure people will get used to it.
I understand you may be frustrated that the Top Killers leaderboard was removed as you feel it is awesome to have your name on a leaderboard or that your hard work in gaining those kills is now invisible to everyone, but it may be that the their is not enough space to have both Skywars and Team Skywars top winners and top killers
Regarding kits, I don't think everything was perfect. Strength was far too op. If you could 4 hit someone in full enchanted diamond armour, it's too overpowered. Chances need to be given to new players who join the server who don't yet have enough points to buy that kit. Also the kit lasts 3 minutes. In an overpowered match, using strength and having enderpearl, you could take out a team per minute on maps like Trees and or Candy. (Not an exaggeration). With teams of 6, that's 18 players killed. Furthermore due to it's overpoweredness, people would always choose it, meaning when you do go to islands and kill people, no doubt you will find more strength pots that you have attained from killing other players.
Regarding the rest of the thread: Post comments that are constructive criticisms. If you feel like the kits shouldn't be shared between Skywars and Team Skywars suggest it in a manner that doesn't imply you're so annoyed that you're going to sell your accounts and leave CubeCraft forever and post hashtags about how bad this server has suddenly become after 1 day, when it is simply not true
I mention that at no time would sell my own, and I remind you that the moderator @Tacosbefriends I asked why the trouble of users to the new team skywars ;)