I would like to see Problem records become more "first class" such that they are useable for proactive problem management, and not just tying incidents together or a place to record problems and forget about them.
Problem records today have no categorization, can't have multiple forms, don't have due date functionality, can't be used in automations or SLAs, can't have custom status (there is another request for this piece), etc. They are an isolated piece of functionality with limited utility.
A use case: vulnerability management fits nicely into ITIL problem management. A discovered vulnerability is not an incident, it is a problem. Typically there is policy in place defining, essentially, an SLA to resolve vulnerabilities based on severity in X days. Vulnerabilities are often resolved through the change process.