Is Trinitarian Christian theism a simple hypothesis?

For theism to be simple, it must follow from some basic property. Christian theism posits an unlimited agent at the core of reality and likewise a perfect being that has no proper parts as per divine simplicity. Christians posit that this is perfect. Thus, Christian theism posits fundamentally either a maximal agent or perfection itself as the core of reality. You’d think that one could deduce a priori what follows from pure perfection of a maximal agent. But the trinity is obviously not derivable a priori from perfection. If you knew that the fundamental thing was perfection itself, you would obviously not expect it to have three coequal and coeternal persons. Maybe one person, maybe infinite, but definitely not three.