You're welcome to create a discussion topic on the OpenStreetMap Community Forum regarding trails to get community feedback. You're also welcome to propose a new policy and tag that would introduce the ability to hide trails.

https://community.openstreetmap.org

https://wiki.openstreetmap.org/wiki/Proposal_process

Rationale for OpenStreetMap's policy regarding trails has been provided to you several times so it's not just "how it is". Additional explanations have also been provided in various changeset discussions with yourself and other mountain bike users over the past week.

https://wiki.openstreetmap.org/wiki/Why_can%27t_I_delete_this_trail%3F

You've had your say but you don't necessarily get to have your way. You need to reach out to the wider OpenStreetMap community and get consensus if you want to change something with regards to OpenStreetMap's policies.