Point 2 is the stated aim. Will there be big difference between say 85% and 90%? Probably not, but it's a politically popular move so they'll keep pushing forwards with it.
I am not sure about the insignificance of 5%. In Germany, hospitals loose personnell, because after 3 big waves people simply can't cope with the stress any more. Every health system in countries which play fast and loose this winter will have a really bad time.
The difference between 85% and 90% is 50% -- ie at 85% there are 1.5x as many unvaccinated people cf 90%.