It's not about being territorial, it's about ownership. I assume you work for a small company. At Big Co. there are thousands of services and APIs. You can't give default permissions to everybody to call every API. That would be a giant security lapse. Other teams let you modify their code but only after they thoroughly understand what you need to modify and what is it that that you are tying to do. They own the code and run in production. So it makes sense for them to critically evaluate whether you should be allowed to do what you are trying to do. All of that takes time and hence multi-day blocker.