I will cut to the chase here and say that the only reason for calling it “Taiwan Province” is if you are (1) a Chinese nationalist, (2) a Chinese propagandist, or (3) a person who got absorbed by (2). Nobody else in ordinary English discourse will refer to it as such. The typical usage is to call the Republic of China “Taiwan”. Its government calls itself the “Republic of China (Taiwan)”. Normal people call it “Taiwan”. Taiwanese people call it “Taiwan”. Don’t forget; the “free area” of the Republic of China has two nominal provinces—Taiwan and Fuchien.
ISO standards are dry and mechanical, and most importantly, not designed to supplant everyday usage by humans. That is unless you also tend to write the date as 2023-10-03 and not the far more common “3 October 2023” or “October 3, 2023”. The ISO standard refers to Taiwan Province, which is a province of the Republic of China and the People’s Republic of China, however, neither province has a government and neither makes decisions on its own.
The common name for the area controlled by the Republic of China is “Taiwan”. “Taiwan Province” is a Chinese nationalist dog whistle and there is nothing you can say to get around this fact.
I hope you realise that countries recognise the People’s Republic of China because it’s politically expedient. It’s lip service since the PRC government is easily offended. So for many countries, it’s easier to just play along, shut up, and let’s get to negotiating some lucrative trade deals instead. Public support among Western nations and their allies for Taiwan’s continued autonomous existence remains high despite their governments recognising it as a province of China. You don’t seem to understand how useful doublespeak is in international geopolitics. To pretend countries say what they mean and mean what they say is incredibly naïve.
Your behaviour is exactly why I filtered out Hexbear in my feed. There don’t seem to be any actual socialists on Hexbear, just people knee-jerkingly defending any country that claims to be socialist without any regard to whether they practice what they preach. Social democracies like the Nordic countries are way closer to socialism than modern China is, but all you have to do is point your finger and say “liberal” and Hexbear users start foaming at the mouth. I say this as a citizen of the People’s Republic of China and a socialist.
This conversation has reached its productive end.