DxO does care, does see the requests, does take the number of votes into account, and does add requests they agree with to their backlog. And yes, DxO also takes their time implementing them.
I cannot agree more about adding votes and comments to the existing feature request topics instead of creating new ones as if that’s going to make things go faster. It just creates more busywork for DxO and for fellow customers!! Add comments to an existing topic and gets bumped to the top of the list, just as if you created a new topic. And it keeps everyone from having to reinvent the wheel and repost their ideas.
Here’s the proof that this is already in the backlog: