alt Hacker News> why romaji is actually good
It isn't. It falls slightly apart in the `s` column, and completely in the `t` column which contains both "chi" and "tsu". It also breaks for godan words that end in "u" which become "wa" in the negative form.
Mu, bu and nu also all obey the -nda transformation due to phonetics, and not due to how "if we just shuffle the letters around and presto! Nomu becomes nonda".
Japanese already has plenty of its own reading inconsistencies, so adding another layer on top isn't going to help you.
Finally, there's going to be so much kana in your every day life that learning conjugation in romaji is guaranteed to cripple your reading, because instead of recognizing kana (e.g. you see a billboard that says お茶を飲んだ方がいい！ as you frantically try to back-translate everything into romaji, but also removing excess w's and converting nda's as you go) you've spent the first n hours on trying to "hack" the language instead of just learning it.
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-u godan verbs historically ended in ふ /fu/ (and earlier /pu/), and were written that way until the 20th century kana reform. So the historical conjugation pattern of a verb like tamau was tamafa-/tamafi-/tamafu-/tamafe- + additional inflectional endings. The /f/ became a /w/ before /a/ but weakened and was lost entirely in other positions, leading to the modern pattern of tamau, tamaimasu, etc. but tamawanai.
> It isn't. It falls slightly apart in the `s` column, and completely in the `t` column which contains both "chi" and "tsu".
All of this is described just below, in the section called “why romaji is actually bad”, with these specific examples being tested.
> It also breaks for godan words that end in "u" which become "wa" in the negative form.
This is also described further below in the post.
> as you frantically try to back-translate everything into romaji, but also removing excess w's and converting nda's as you go
I see “understanding the system” and “applying it fluently” as two separate activities. I find romaji more illustrative for the former because the system is phonetical on a sub-mora level. Whereas kana is more helpful for the latter. I don’t assume my reader is an idiot, and so I assume that they would be able to pick the right tool for the job on their learning journey. The fluency always layers on separately anyway, understanding doesn’t “help” there. It’s just that personally I find understanding a great motivator (and fallback) for developing fluency.