There are no black holes; they are 'just' black eyes. Still nothing to sneeze at, but there is no invisible mass beyond a horizon. It is very simple to explain.

1/ Masses in a Galaxy

2/ Gravitational Monster in the Center

3/ Invisible Mass inside that Center

A Black Hole is #3 explaining #2.

A Black Eye is #1 explaining #2.

What would you rather have? Something for which we will never get any confirmation explaining #2? Or something that is readily available explaining #2?

#3 does not give off any data. That is the whole point. That what causes #2 is itself not visible.

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The solar system has a gravitational entity in the center.

The galactic system does not have a gravitational entity in the center, except for the Eye.

The Eye is empty, but the Wall of the Eye is the #2 monster. The Wall of the Eye will not let through any photon, so the center will be black. The Wall of the Eye will light up because that is the pathway for the photons that could not take the straight line through the Eye.