and you CAN use static_cast to convert from void*; this silently keeps working if you refactor the void* into a matching-type pointer later, while raising a compilation error if you refactor to a different-type pointer.

Yes, a static_cast would be safe, but then most C++ seems to use a C-style cast because it is less clunky and then is less safe than the corresponding C code. The issue is not that the downcast is unsafe (it is, but once you have a void pointer you already accepted this), but that it becomes even less safe by adding a C-style cast.

It is also not clear what is gained by forcing programmers to add a cast. Void pointers should be used sparingly anyway.