I think GP means that you know that for this one pipeline related to commit X you want manual step Y to proceed once previous steps are ok, and you know it righ

I think GP means that you know that for this one pipeline related to commit X you want manual step Y to proceed once previous steps are ok, and you know it right now, so instead of waiting for previous steps to complete you want to trigger the step in a delayed fashion. Kind of like "merge this as soon as tests pass" on MRs.