At some point you might as well use Roman characters the way the Cherokee alphabet does - which is to say, uses some of the shapes without paying attention to what sounds they made in English.
I'd expect that Spanish, German and French speakers would benefit just as much as English speakers from these changes.
Its not far off from the union of how all other European languages use the Roman alphabet, would be closer to accurate.
There is no way "every other language already uses the Roman alphabet."
Many languages are internally consistent in how they use it, but those that are aren't consistent with each other. And then there is English, which does pretty much everything any other language which uses the Roman alphabet does somewhere, and probably a few that none of the other extant languages normally using that alphabet do with it, on top.
Additionally, being written in Roman alphabet doesn't neccessarily mean it's clear how to pronounce it. Hungarians calls their country "Magyarország", but unless you know Hungarian, you will be surprised with how it's pronounced. Same as "Chenonceaux", "Tekirdağ" or "Crkvina".
Already done.
- Komen ça va? - Mo byin, mærsi.
We don't have anything against https://en.wikipedia.org/wiki/Louisiana_Creole, do we?
Romanization is, by and large, a thing that exists for people who already know European/Western languages.
But it's a reality that English is the primary (if not sole) focus, for historical reasons and as the global lingua franca. English is taught (poorly, from what I hear) in schools, played on train announcements, is the only Western language available on ticket machines, and is the assumed language of non-Asian visitors to the country. I was even on a couple of domestic flights a few days ago and the captain / FAs made announcements in English. It is not "arbitrary" at all.
Use *h₂enǵʰ-ish please.
English is already heavily Norman-ized. Half of our vocabulary - including the word pronounce - comes from French.
Romanization is an approximation that exists primarily for two purposes: 1. to express Japanese terms in other languages and 2. to enable typing Japanese on a computer. It’s silly to enforce kunrei-shiki, a system rarely used in practice, in the name of "accuracy" based on arbitrary criteria. Romanized spellings will never be accurate for obvious reasons.
Given the purpose of romanization, it’s more practical to choose a system that allows non-Japanese speakers to pronounce words more closely aligned with the correct pronunciation.