It depends on the organization. In my org, the people most often interrupting us either have 1. Power of the purse. They fund our teams and ultimately determin

It depends on the organization. In my org, the people most often interrupting us either have 1. Power of the purse. They fund our teams and ultimately determine priorities 2. Organizational mandate. Blanket authority to dictate standards and penalties for non-compliance (which may include unilaterally shutting your service down). The best you can hope for in these cases is to surface the costs to those people and hope they are making rational decisions.