Why does Python installed via Homebrew not include Tkinter

I am running MacOS Big Sur (11.2.3).

With python2, I have Tkinter built-in.

With python3, it has to be installed manually and it’s very simple, just run:

$ brew install python-tk

To run python2 in a terminal, execute python file.py.

To run python3 in a terminal, execute python3 file.py.

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