I think the important facts are these:
Not.
i) much of the world does not understand ISO-2022, therefore if you send
Much of the MIME implementation does not understand ISO-2022.
ii) by using MIME to label your use of ISO-2022, you give the recipient
a way to know (at least, and maybe see) what you intended.
By using ISO 2022 to label, the recipient has a way to know (at least,
and maybe see) what we intended.
MIME is `on your side':
Sure. Not front nor back, just side and unrelated. It contributes
nothing to have multilingual single text.
(but many people will not be able to read your messages).
Are you saying you can read Japanese message if and only if it
is labelled by MIME?
Masataka Ohta