Gotta see if this is on the Thai language/culture resources posts, but this is a language thing that's always bothered me:
Why, when languages are transliterated into English, do people use transliterations that don't make sense in English?
In the context of Thai, this comes up for me with the hard "T" or "P" sound being spelled with a "Th" or "Ph"
But I first thought of it way back when I got involved in anime fandom, and people transliterate long vowels in Japanese to English with double vowels:
"Aa" instead of Ā (to indicate the acknowledgement noise/yes)
"Iie" instead of īe or, idk, eeay
"zanpakutoo" instead of, idk, zanpakutō or zanpakutoe
I ask this because (for the Thai example) I tended to assume that, for instance, Phongsakorn was pronounced "Fongsakorn", like with the "F" in "Fog", rather than "Pongsakorn", like with the "P" in "Pong"
And "Theerakit" was pronounced "Theerakit" like with the Th in "These", rather than "Teerakit", like with the "T" in "Tea"
And, for Japanese, English doesn't really do long vowels very much, so I can see that being harder to transliterate properly, but the way it's transliterated still feels like it lends itself to mispronunciation? Because if the transliteration is for native English speakers:
"aa" looks like i should hold the short English A vowel sound, not like I should pronounce it something a longer version of the first o in "octopus"
"ee" looks like I should be prouncing it like the ee in "eeek", not like a longer version of the first e in "nether"
"ii" isn't going to read like the eee in "eeek", it reads like the sarcastically long "i" in "iiiiii don't know what to tell you"
"oo" is going to read like the oo in "oooo it's a ghost" rather than 'hey you should hold this vowel for another beat'
"ou" looks like, variously, almost what it's meant to look like ("arigatou" actually does parse as an English long O vowel sound, although it still doesn't parse as a sustained vowel sound)
OR, "ou" looks like it should be pronounced like the "ou" in "dour" or "hour" ("Kaname Tousen" could go either way for me)
With Japanese, I can reason out the problems - there's really no good way to transliterate a long vowels without using the diacritics, but those take extra effort to type, and most people didn't know how to type them in [insert word processor of choice], so basically you had to learn a whole new spelling and grammar schema, and this was at least easy to pick up.
With Thai, it's a little less clear, because it seems like there's already a one-for-one transliteration of the sound you're going for, so why use a different combination of letters?
I guess what I'm ultimately wondering is, are my ears broken? Am i missing some nuance to the pronunciation of the TH and PH phonemes, that makes it important to differentiate between T & Th, and P & Ph?