Arcane Problems:
The no-hair theorem is summarized in a famous aphorism of John A. Wheeler (1911--2008): "black holes have no hair" which just means they are simple objects---in a certain sense---without a lot of features like hair, fingers, toes, etc.
In fact, the no-hair theorem even if NOT fundamentally true is probably a useful model of black holes for many purposes, but NOT those deep in the realm of fundamental physics.
See Wikipedia: Special relativity: Causality and prohibition of motion faster than light.
Actually, since 2012, there been renewed controversy about Hawking radiation.
Hawking radiation it has been realized leads to the black hole firewall paradox: