Is There a Policy for What Pip Will Accept?

Has there been any thought to put in levels of what pip will install? For example, i want to set up my pip, though it will only accept things that have to afe set up. I think the reality, at least right now, is that any kind of policy like that would not be enforcible. There's going to be some edge case, some dependency that's superold or whate like tha. But ye, i mean, thes definitely potential. Ray.