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".
I'd expect that Spanish, German and French speakers would benefit just as much as English speakers from these changes.