The devs do not understand this forum could be an extremely valuable crowdsourcing resource.
Personally I think devs should come on the forums 3-4 times a year, talk balance with pro-ranked players and discuss how to make useless cards useful. I think most players would want to see more deck diversity and devs aren't going to see a lot of information about cards just from looking at statistics (which cards get played the most, which ones have highest winrates). This game could be a lot more fun if devs setup periods to take pro-player feedback on various mechanisms to not only improve the game and balance out weaker or useless cards, but also open up discussions on some of the metagame itself and why some cards are so much stronger than others.
Overall though, I am happy with Gwent, but Gwent could be an S-tier card game (instead of A tier) if devs put some love into the community. But this must be something the devs want to do, they actually need to feel passion for making Gwent into a masterpiece, otherwise it won't work.
Community managers would also have more of a role if something like 3-4 big events happen per year, and could structure threads to help summarize discussions between the playerbase and devs.
So for example, Dev opens a thread on say, Nilfgaard, and asks for pro player feedback (anyone who has had a pro ranked NG deck for 2 seasons or more is eligible to post) in under 100 words, pro players respond on cards they like/dislike, which ones are bad or strong, etc, and then a community manager reads all the replies and summarizes it in a post in the same thread after a few days. The dev returns to read the summary, which, since players have also read, the players could also have objected to the community manager's summary if needed to edit the summary, and then the dev responds to the summary with his thoughts. This process repeats 2x a week for two business weeks (weekends are off!), and the end result would be a exquisitely crafted game with tons of interesting cards.
Furthermore, if players would expect that the devs will come in 3-4 times a year for a balance/design discussion of some kind, then this would encourage the normal forum users to engage one another so that when a dev shows up, the forum will have reached some sort of consensus on what to present to the dev. This consensus will be more true for pro-players with lots of playtime, because the meta of Gwent isn't up for too much debate, but no matter if a consensus is reached or not, forum activity will greatly increase.
So obviously, I voted for more dev involvement, and I hope a dev reads this post and sees there is a low-effort way for them to both improve their game and utilize the existing forum. A smaller forum like this will always be better for brainstorming and discussion due to the lower noise levels than a shitstorm like reddit or twitter.