Earlier quoted context omitted.
I'm saying I disagree. It is always a crutch for the first year student or the barely passed second year student that never helps with real Japanese. Writing out romaji in Japan is likely to confuse more than help someone else understand.
You glossed over my point. I’m not using it as a “crutch” for reading. I’m using it to have notation for the stem — the thing before -u. I could choose alternative notation with kana (e.g. just always using the -u ending, or the idea of variable stems like i-stem and a-stem) but then the visual “gluing” wouldn’t work. Which is the whole point of mental model I’m communicating. It’s fine if you don’t find this mental…
Latin text's smaller tokens/phonemes have advantages and disadvantages, but they are a convenient notation for getting the author's point across.
The difference in phonemes reminds me of how game designer Naramura came up with the (Spanish-sounding) name "La Mulana" for his game by spelling his name backwards in kana. In romaji it would have been "Arumaran" which is completely different (while in kanji it would have been "Muranara".)