Yes, of course RAII is much shorter than a contrived example designed to be as long as possible. Here's a much shorter version:

    int unsafe2()
    {
        A* a = new A;
        int retval = 0;
    
        if (a->f())
        {
            B* b = new B;
    
            if (b->f())
                retval = b->g();
            else
                retval = a->g();
    
            delete b;
        }
    
        delete a;
        return retval;
    }

I agree that RAII is a good thing, but can we please avoid straw-man examples?