关于tkinter的w.destroy()方法未彻底清除Widget对象的技术问询

我在Python解释器中执行以下命令后发现，tkinter组件的w.destroy()方法并未彻底清除该组件在Python中的对象引用：

>>> root=tk.Tk()
>>> a = ttk.Button(root, text="Button")
>>> a.grid(row=0, column=0)
>>> a
    <tkinter.ttk.Button object .!button>
>>> a.destroy()
>>> a
    <tkinter.ttk.Button object .!button>
>>> a.grid(row=0, column=0)
    Traceback (most recent call last):
      File "/usr/lib/python3.10/idlelib/run.py", line 578, in runcode
        exec(code, self.locals)
      File "<pyshell#23>", line 1, in <module>
      File "/usr/lib/python3.10/tkinter/__init__.py", line 2522, in grid_configure
        self.tk.call(
    _tkinter.TclError: bad window path name ".!button"
>>> b
    Traceback (most recent call last):
      File "/usr/lib/python3.10/idlelib/run.py", line 578, in runcode
        exec(code, self.locals)
      File "<pyshell#24>", line 1, in <module>
    NameError: name 'b' is not defined
>>> del a
>>> a
    Traceback (most recent call last):
      File "/usr/lib/python3.10/idlelib/run.py", line 578, in runcode
        exec(code, self.locals)
      File "<pyshell#26>", line 1, in <module>
    NameError: name 'a' is not defined
>>> root.destroy()
>>> root
    <tkinter.Tk object .>
>>> del root
>>> root
    Traceback (most recent call last):
      File "/usr/lib/python3.10/idlelib/run.py", line 578, in runcode
        exec(code, self.locals)
      File "<pyshell#30>", line 1, in <module>
    NameError: name 'root' is not defined
>>> 

根据tkinter官方文档描述：

w.destroy()
Calling w.destroy() on a widget w destroys w and all its children.

在上述测试中，调用a.destroy()后，按钮确实从界面消失，且无法再执行任何tkinter相关方法（会抛出_tkinter.TclError），但Python解释器仍然将a识别为<tkinter.ttk.Button object .!button>对象，只有执行del a后，再调用a才会触发NameError。root.destroy()也存在同样的现象。

我认为tkinter的维护者应该在.destroy()方法中加入del w逻辑（w指代任意tkinter组件），否则用户每次调用w.destroy()后都要手动执行del w来保证代码整洁。请问这个思路是否合理？

以下是我自己实现的一个类方法示例，用来清除类属性中的组件引用：

>>> class App(tk.Frame):
        def __init__(self, master, **kw):
            super().__init__(master, bg="pink")
            self.master = master
            self.bn = tk.Button(self, text="Button", bg="cyan", width=10, height=2)
            self.bn.grid(row=0, column=0)
        def eradicate(self):
            del self.bn

>>> root = tk.Tk()
>>> root.geometry("150x150+10+10")
    ''
>>> app = App(root)
>>> app.grid(row=0, column=0)
>>> root.columnconfigure(0, weight=1)
>>> root.rowconfigure(0, weight=1)
>>> app.eradicate()
>>> app.bn
    Traceback (most recent call last):
      File "/usr/lib/python3.10/idlelib/run.py", line 578, in runcode
        exec(code, self.locals)
      File "<pyshell#116>", line 1, in <module>
    AttributeError: 'App' object has no attribute 'bn'

内容的提问来源于stack exchange，提问作者Sun Bear