How certain is the evaporation? Obviously Hawking radiation has never been observed, but is it tied in enough to other known physics that we can be reasonably certain it exists?
If it doesn't exist its also has profound implications for the long term fate of the universe, since it would mean black holes never evaporate.
the whole thing started with information paradox, leading to the suggestion that a black hole would have to be associated with entropy, thus would have a temperature, but required an escape hatch to allow radiation, the thought experiment came to a thought solution when particle-antiparticle pair dissociation at the event horizon was postulated.
We Knew Black Holes Have a Temperature. It Turns out They Also Have a Pressure[2021]:
https://www.universetoday.com/articles/we-knew-black-holes-h...
Black hole thermodynamics: