They should be perhaps closed only manually after explicitly marking as resolved or maybe automatically due to inactivity of reporter asked for additional data. Not just due to Bitrise staff inactivity.
The Bitrise community forum is primarily for the community to help each other. It is not a main method of accessing support for Bitrise, which is why some tickets go unanswered.
I highly recommend you creating a GH issue for bugs and those types of issues and a support ticket through for all other requests: https://www.bitrise.io/bitrise-support.