Adding support to this improvement - would be very helpful!
Our current workaround is an additional Yes/No property on the playbook - setting to Yes triggers the desired workflow(s). The main drawback is that the person submitting the playbook needs to remember to do this extra step. The reason we don’t use petejam’s solution is that not every field needs to be filled out on every playbook.
It would also be helpful to allow certain playbook inputs to be required (that feature request is here: https://community.hubspot.com/t5/HubSpot-Ideas/Required-Playbook-Fields/idi-p/262083)