Actually, some things _did_ break and required wonky work-arounds (redirect through three top-level domains to set cookies so you can show the user a page composed from three different systems embedded widgets) and at some point we'll have to make it work better. But while Apple and company are aware of this use case they don't have a solution that can't be _also_ used by ad companies as well as integrators ... so it gets harder to integrate on the front end, unless you trust all the things being integrated implicitly (which you don't)