Why not just be an Independent Church?

Why not just be an Independent Church?
For the most part, Full Life is an independent church. Every Assemblies of God church is completely independent. There is no denominational control or hierarchy as in some denominations. Full Life is self-governed and we make our own decisions. For example:
Every AG church chooses its own pastor.
Every AG church owns its own buildings and assets.
Every AG church determines its own ministries.