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You have an aircraft that without let or hinerance can fly all over the world due to the fact that the issue of a C of A ensures that the aircraft is fit to do so.
The people over whos heads you fly expect the aircraft to be in such a state that they will not fall out of the sky and the expencive paperwork trail required for the C of A helps to ensure that the aircraft are safe.
I might remind you that the private C of A lets you do the 50hr/6m checks your self saving you the expence of a licenced engineer.
If in a year or two,s time a part of your Cub that is critical to safety is found to have a manufacturing fault it can be traced directly to your aircraft and changed before it fails in flight , without the paperwork trail the first thing you are likely to know about the fault at manufacture is as you plummit towards the ground.
As the old saying goes "If you think that saftey is expencive try having an accident".