With Hawking radiation, how long would you expect two "identical" black holes to stay truly identical?
Similarly, if you have a collection of atoms made of the same unstable isotope, if they were truly identical, they'd all decay together at once, but they aren't truly identical. Their electron clouds might be indistinguishable, but their nuclei aren't. Likewise Hawking radiation is a detectable aspect of something that keeps these black holes distinguishable... what exactly that is will depend on what String Theory resolves into (i.e. we don't completely know yet).
Forming opinions as we speak