I think it’s probably a mistake to use Hepburn if you’re learning Japanese, it kinda gets in the way. Either learn kana (which takes what, a week?) or use one of the other romanization systems which maps more cleanly to Japanese orthography
I've never understood how people can claim that learning kana takes a week. It clearly takes more time than that, considering how similar some of the symbols are and a lot of them only differ by double dashes or a stroke (think nu vs me, ne vs re, ro vs ru, chi vs sa, and so on). Then there are the combinations and even if you managed to learn hiragana, you still have to learn katakana.
Oh and I forgot, you have to actually learn how to listen, pronounce and speak them, not just learn a useless romanization mapping. I've heard way too many English speakers just say the romanization with English pronunciation. At that point their learning efforts turn into self sabotage.
In total that's definitively a month of effort, albeit spread out over the first year of learning.
It’s a deliberate choice in the article. I cover every single caveat with it explicitly. I also mention this:
> (note i could also have used a different romanization that renders し as "si", つ as "tu", and ち as "ti" for this article. i decided to not because everyone else uses romaji, and once you understand this point once, you shouldn't have a difficulty doing this in your head.)