The feature that is sorely lacking from the "Jira Power-Up" in Trello is automatic synchronisation between Trello and Jira. I'd like to keep replica boards in both apps that are always in-sync. Both two-directional (for internal boards) and one-directional (e.g. filtered one-way sync to a customer-visible board) would be ideal, but two-directional sync is most important.
If you're an M365 user, there are connectors for both Jira and Trello that could sync. Maybe automatie.io
https://automate.io/integrations
Don't much like paying a third party to sync two Atlassian products. (A bit galling at this point. We spend a lot with y'all.) Really need this feature to be native soon.