Doing the work that you don’t really want to do but is paramount for you to do so you can focus on what will take you there.
In other words:
You are not going to get away from all the mundane tasks that go along with your startup when you start out (and there are many).
This is a test.
The test is whether you are dedicated enough to put in the effort to do an exemplary job on the mundane before you get to the cool stuff.