I think more people really need to understand this. At the end of the day SE is a business. But they're not gonna change if you just keep subbing despite your grievances. Maybe you leaving won't change anything, but why does it have to be about that? If you (not specifically you Banriikku) are so dejected by the game than that alone is enough reason to unsub. Why give your money to something that isn't giving you your money's worth? Giving feedback is one thing, but it's not my job to spend years sitting on the forums trying to give feedback to a dev that isn't even listening.
There are plenty of far better games out there that I could give my time and money to instead right now. I think some people, particularly MMO players due to sunk-cost-fallacy from paying a subscription fee for so many years and being invested in their characters, get way too emotionally attached to game and that becomes their reason for staying, and gradually they become jaded and some turn toxic. It's a video game at the end of the day, and at a certain point you really just need to step back and ask yourself if this is really worth your continued time and money.
Just proving my point by how you're acting. They haven't listened to you for the past however many years, I don't know what exactly you're attempting to accomplish at this point. Many of you have even ADMITTED that you know they aren't listening. So why do you come here? Other than to cope and farm likes. I think you're just mad and come here to vent your frustrations. At that point, yeah, you are just wasting your time and money. Or if you do in fact think they devs are listening to this place, than insulting other posters, and the devs, is the exact opposite of what you should do, you're only ensuring nobody will listen to you ever. But if it makes you feel better than by all means, it's your $15/month.