ReverseBuildTrigger supports any ParameterizedJob, behaving as a DependencyDeclarer if both sides are AbstractProject, behaving as a simple Trigger otherwise. BuildTrigger should do the same, behaving as a DependencyDeclarer as now if both sides are AbstractProject, behaving as a simple Notifier otherwise.
Would allow Build other projects to select a workflow job. Workarounds:
JENKINS-26050, if implemented; use of ReverseBuildTrigger, in the common case that it does not matter which side declares the trigger (but not when Item.CONFIGURE is restricted on one side, job templates are in use, etc.).