I really wish they would emphasize this forum a lot more. Many people already had a Discord account, but making a forum account is an extra step that people will only take if they care about the game enough to post a more serious bug report or get more involved.
Valid feedback will definitely come from Discord and Steam, but they should put a lot of emphasis on their official forum. 
But, it’s possible that they take a lot of feedback from here too. I would like to see the official forum be developed a little more to include aa general discussion place as well. This would be a great community hangout that’s outside of Discord. The inZOI team has full control over the whole place, so it could be perfect for the studio and players.