Issue trackers like @Jira and
@github encourage issue reporters to add as many
issues as they like. What if instead issue trackers would show on the "create
issue" screen a linearized view of all issues, and what people are working on
now?

You could not select the priority from a list (major, minor, ...) but would be
forced to rank your issue within all existing issues because there can only be
one issue with priority 1, or 2, or 99. It's like having a kanban lane per team
member.