Every forum post I've seen mentioning 白話字 and 台羅 mentions how hard it is to read and how few Hokkien speakers can even read it. The few proponents for it seem to be holding on for religious reasons (Presbyterians).
You can still do something similar in English where you say your name is "rainbow" but you spell it "rhaynbeau",
This is an insulting borderline racist comparison and ties to the same old western trope of treating our names like random sounds. "rhaynbeau" Isn't a word and doesn't carry any meaning.