We established feedback.photoshop.com for Photoshop and Lightroom customer feedback many years ago so there was transparency in the requests and customers could "upvote" various topics. The Lightroom team grooms that feedback to combine similar or duplicate requests. The voting goes directly into our backend bug and feature tracking system(Jira). While it's true that some topics have been on the "backlog" for a long time, I value that transparency rather than burying customer requests which is what happened in the past.
Or you can always email me directly. I can't guarantee a quick response since I receive ~500 emails a day but I'm always happy to receive feedback on the Lightroom family of products.
Regards,
Tom Hogarty (thogarty adobe)