These are completely different scenarios. Death should be fully covered by insurance during repayment, while disability insurance should possibly be covered partially.
Unemployment insurance is intended for point 1. The deficit should of course be taken into account in the affordable installments - meaning: short-time work or unemployment benefit I will not cause the financing to fail immediately.
In my opinion, the last two points are rather wishful thinking and simply no longer realistic today - especially not with the mentioned 3% minimum repayment. In our discussions, we mostly have installments of €1300 - €1600. The necessary individual income for a 40% share is €4000 net for a single earner with €6000 gross in tax class III. In tax class V, that is €3400. That is certainly not average and too high for many home builders. We often have total household incomes here of €4000 - €5000.