I actually agree with the OP somewhat. While I can agree that there are more useless suggestions than valuable suggestions in this subforum (as Aggraphine and Fuhreak mentioned), Nexon is allergic to pretty much all suggestions. I understand that Nexon cannot acquiesce to the requests of every single player, but when an overwhelming majority of players have a legitimate concern with certain content and the Nexon team brushes it off, then it says to me that Nexon does not regard our feedback.
For example, I'll use two examples: Potential=able / Pottable Badges and the Phantom Forest revamp. I understand that pottable badges were removed because of Nexon Korea, and while I don't agree with their decision, it's a complex issue that I can only see being resolved by Nexon Korea adding pottable badges as a new standard in KMS (which is very unlikely, despite the fact that Rings and Shoulders used to not come with potential when they were released). Therefore, despite players asking for pottable badges to be re-introduced to the game, I don't see it happening due to Nexon Korea.
As for the Phantom Forest revamp, this is content that is currently GMS exclusive, and has been universally panned by GMS players due to the sanity system causing memory leak and personal ailments such as migraines and motion sickness. On top of that, the new Masteria's Legacy set requires Shadowknight Coins to Star Force (which pretty much everyone agrees is a stupid idea, since it's worse than the Superior Gollux Set), and in order to obtain said coins, you have to spend a minimum of 1 hour farming in the Phantom Forest doing daily quests, which isn't even guaranteed since the daily quests require you to defeat a specific Elite Boss in the area to obtain all the coins from the daily quests (keep in mind that only 1 out of 3 will spawn, and it's always random). Despite this content being despised by players, Nexon has only taken minute steps to improve the content, making minor changes to the sanity system and throwing more Shadowknight Coins our way (also, so much for including it in Sunny Sundays, since they haven't been included in any in the past month or so), which are band-aid solutions at best, and don't resolve the core issues with the content. As a result, despite the feedback given, Nexon has utterly disregarded it, and the Phantom Forest is dead content thanks to their negligence. If this were under Nexon Korea's, they would have taken steps to make it more enjoyable for players.
In conclusion, Nexon has little to no regard for player feedback, especially when it comes to non-KMS content, only choosing to rework it if it benefits players rather than if players have issues with the content that could be mitigated to improve player satisfaction. I would suggest that Nexon delete the Suggestions, Feedback, and Requests subforum (ironic, ain't it?) because it merely exists to give players a false sense of hope.
I mentioned before that the Lion King's Castle achievement had a similar issue, but it was fixed. Therefore, Nexon should either A. propose a solution similar to the LKC achievement or B. Add a new map that we can access to the achievement, and (hopefully) allow us to complete it by visiting said map.
And no, an achievement update / refresh doesn't solve it.