Based on a sibling comment from raincole, Traditional Chinese isn't used in China at all. Shouldn't the translator then simply output the Taiwanese (and, according to them, Hong Kongese) variants when selecting that language, rather than the language having two possible words to use?
you are right though that any downvotes are not justified (can't see/tell since the comment isn't grayed to me).. although not for the reasons you stated. the downvotes are not unexpected though, because of the political landmine the parent comment stepped on.
also pinyin is pinyin. what you are describing is wade-giles, which was the common romanization technique of chinese well into the 20th century. it is not an "unintuitive pinyin" system because it is not pinyin at all. the error exists because the technology systems of the products you used did not support it. someone had to write tooling to convert pinyin into the correct chinese characters, they are the ones who forgot to do the same for wade-giles in taiwan.
it is like complaining that you couldn't get anywhere in uzbekistan because they currently use a "unintuitive local latin script"
However, it is worth noting that there was basically an iron curtain between China and Taiwan for a long time after Chiang Kai-shek went there. A lot of IT terminology for example developed separately in Taiwan and China, so a lot of technical terms are different. The following website lets you look up scientific terms and convert them between china mainland and taiwenese.
https://terms.naer.edu.tw/