clang: -Wweak-vtable for defaulted virtual destructor

I know about similar questions, but still would like to understand if described warning is pointless or not.

Potential duplicates could be:

• clang: no out-of-line virtual method definitions (pure abstract C++ class)
• What is the meaning of clang's -Wweak-vtables?

but I still have a feeling, this question is different.

Let's imagine that I have a base class implemented as NVI.

  struct server_strategy
  {
    explicit server_strategy(std::string name) : name_{std::move(name)} {}
    virtual ~server_strategy()=default;

    zmq::message_t handle_message(zmq::message_t request)
    {
      // ...
    }

    std::string const& log_channel()const {return name_;}

  private:
    virtual zmq::message_t do_handle_message(zmq::message_t request) =0;


  private:
    const std::string name_;
  };

Compiling this class makes Clang issuing the warning:

error: 'server_strategy' has no out-of-line virtual method definitions;
its vtable will be emitted in every translation unit [-Werror,-Wweak-vtables]

Question: Why does =default makes sense at all in context of virtual destructors? Don't you think that this warning is overkill in that context? I mean if I explicitly declare virtual destructor as defaulted than I probably don't want to introduce an additional .cpp file and I know that compiler is going to pick any translation unit for its implementation.