We use them when we try something new. Specifically when that new thing is hard and risky. It provides some security while we create new mental pathways.
It allows us to focus all our energy on getting the critical things right, without using precious mental faculties calculating the risks.
Eventually, you take away the net.
Safety nets are a great way to learn difficult skills. They are not good at teaching you to perform under pressure. Risk teaches us that.
Business Incubation is a great safety net. It creates positive space to focus all your energy and assets on creating a new business. It can only take you so far.