Actually Adrian said we should "make decisions" I say "give advice", based on valid technical knowledge/clinical evidence of good/best practice and let the Surgeons make the decisions.
I do agree that technical advice is absolutely necessary but we should only work in an advisory capacity. Surgeons must not assume everyone is an "expert" just because they work in Medical Engineering/EBME/Medical Physics. Otherwise they put themselves at risk when poor advice is given.
Where do you stand if your advice is incorrect and causes an incident DD? i.e. How would you feel if the advice you gave actually harmed a patient - who would act in your defence - the Surgeon you advised? How would you demonstrate your competence to give advice?
Finally do you have the authority to take that sort of responsibility on your shoulders and that of the organsation where you work?
