Thank you for posting this in-depth review of Bixby! I'm very glad to hear that you've taken the time to understand Bixby as an extension of the overall Samsung experience—rest assured that the R&D team is hard at work developing new features!
Side note: I just wanted to say it's always nice to hear from users like you, so please keep sharing your thoughts and opinions with us! Samsung Members is a great platform for this 😊
For suggestions, I think the best way to gain visibility is to post here through the Members forum—the ticketing system in-app is intended more for bug/error reports. Basically, what you're doing now is perfect!