Einstein’s General Relativity contains the Laplace operator of a sphere of incompressible liquid.
It links the time-like solution (how fast does the clock tick) directly with the gravitational potential: no need for using tensor operations.
He never applied it to the potential inside a sphere.

This article is doing so, which leads to surprising results.

The gravitation potential forms now an elegant continuous equation from the centre of mass to infinity.
Applicable for a celestial object.

Checking its minimum, it also results in the Schwarzschild radius always being smaller than the radius of the sphere.

The conclusion must be: Black Holes really don’t have a so called ‘Event horizon’.
‘Falling through the event horizon’ is a myth!