In my experience they figure the worst possible case scenario and it's up to you to refuse any treatments (vs a place in the Usa, for example, that would screen out low probability conditions and not test for those, or not bother with a treatment for something that would just clear on it's own 95% of the time).
Kind of like going in for something minor and getting every possible test for something it could be related to. What should be done is the doctor should screen from experience and kind of know what should be treated, rather then just treating every possibility even if it has a small chance of being the cause.
The intubation thing may not be "needed", but rather something that's being extremely careful. Thus they ask for permission. So the family asks is it really required? Well, yes. It's required if it's ultimately needed, even if the chance is rare. That sort of thing. What you need is a doctor that makes those decisions on their own with professional competence from experience.