About 30% of people worldwide use a language that's not written in Roman alphabet.
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".
Those are especially pathological cases, and not especially relevant to this discussion, as the romanization rules are explicitly designed to be consistent.
Okay, I misread the context of the discussion. I apologize.
Worcestershire.
We're not talking about words like worcestershire. I'm talking about words like "bat" "monkey" "chimichanga". Those that follow the rules. There can't possibly be irregular spellings using the romanizations we're talking about!