Due to its inclusion of the gravitational constant. The reason simply being that any 'force' must always have an equal and opposite force preceding it, as is consistent with the most fundamental of physical laws.
The gravitational constant in both GR and Newtonian gravity describes precisely the opposite: a force that, as far as the math in the equations describes, comes out of no where.
The tensors describing warped space-time in the General Relativity field equations do not, themselves, describe any attractive force. Without the gravitational constant in the equation, there would be no explanation for the phenomenon of free-fall; objects in a gravitational field at rest relative to the gravitational field would simply hover there - although a curvature in the object's path would still be evident when that object is moving.
In this manner, the inclusion of the gravitational constant is a sort of 'easy way out' of having to explain the origin of gravitational attraction what initiates free-fall.
If you ask me, what is actually occurring takes place at the subatomic level:
The Zitterbewegung (German word for trembling motion) of all particles at the subatomic level, where particles move spontaneously in different directions at the whim of any/all fields affecting the particle, results in the trajectory of subatomic particles to resemble what could be thought of a knot.
Due to this momentum in multiple different directions in a short increment of time, the particle experiences free-fall as it travels faster-farther when traveling through the warped space-time of a gravity well.
Gravity, then, is not an attractive force at all; rather, it is the macroscopic consequence of repulsive forces at the subatomic level.
Because of this, gravity can never be its own force in the standard model, as it is the result of many existing forces which accumulate into the observed effect of gravity.
In order to be a complete model of gravity, the gravitational constant would have to be replaced with local averages.
A new tensor might also need to be added describing the blocking of radiation by massive objects and how it contributes to the object's gravitational field.
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General Relativity Isn't a Stand-Alone Model for GravityPariah :Care:y
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