Welcome.
I don't think they need any help understanding player opinion. It's not like they're really having trouble understanding the concerns that people have been posting for years. That's not why development has been slow. I'm more willing to guess that's due to large changes being made to the game, or roadblocking bugs.
I don't usually frequent the suggestion section, but I will say that they have used some of the very detailed posts (ex: the guild hall post) as starting points. If you have dev experience, consider a realistic suggestion as you doing uncredited free labor ("labor of love") to do full game design on a feature - taking into account the features, the functionality, balance for all levels of players, possible potential for monetization, etc.
Maybe it's the cynical ex-game-dev in me, but you know, as long as they have a clause somewhere saying that you aren't entitled to anything for giving your ideas, suggestion forums are a nice way to get free game design work. The main problems with the free labor are that most of it is poorly-thought-out or that they might not fit with the direction of the project as it is.
But hey... if you can make a video or quick prototype, all the more power for your own suggestions lol. It's probably better for you to use your time on your own projects, but that's my own take on it.
-----
That aside,
- Updating official SK videos would be nice
- Dev videos would be oh-so-interesting, but as we've seen with the Gunner Update, when they announce things that they're working on and they get delayed, players get mad. :3
I think it's not too much to ask, just show progress on the game, how things are made, ect. Maybe cover it all in one neat little video. But here's the thing, they KNOW our opinions, most of the vets are not happy, new players are oblivious, and the new ones who do know are wondering "should I play this game?"