How important is building to make it clear?

My uncle started playing fortnite a few weeks ago but finds it totally unnecessary to build because you are only betraying yourself. Now I want to make it clear to him that building is an important part. But how do I do it?

Say you can protect yourself if you get shot.

His answer is yes then you can go behind a tree… Somehow I can understand him I saw it exactly the same at the beginning only I just adapted

Then kp