You will never understand why every US president since the Chinese civil war has said Taiwan is not a separate country? You will never understand why every year more nations drop the historical alignment with the former fascist dictatorship of the civil war's losers to the current internationally recognized government of China? You will never understand something that has been understood for literally 70 years?

Sounds like a skill issue.

It doesn't matter what the people outside China think. The people inside China - on both sides of the Taiwan strait - think Taiwan is part of China. They all call themselves Chinese except the tiny minority that speak with American accents. There are indigenous ethnic minorities on Taiwan whose ancestors were not part of China, but they didn't call themselves 'Taiwan' because that's a Chinese word.

You think it's absurd that some people think the Republic Of China is part of China?

I get that names aren't everything, but it reflects both the recent history and the de jure policies of the ROC, PRC, UN and USA.

Don't say that in Taiwan. You might get into trouble.

Taiwan, or rather The Republic of China, claims to be the legitimate China. This includes all of the mainland. The losers of China's civil war fled to Taiwan, but their claim to all of China continues.