Because it would be a BFD (big f- deal), to use Joe Biden's own words.
The only time in history that a U.S. president visited Taiwan was when President Eisenhower toured the country and met with former ruler Chiang Kai-shek in 1960. President Trump's phone call with President Tsai Ing-wen was the first time a U.S. president-elect had directly spoken to a Taiwanese leader since former President Carter severed diplomatic relations in 1979.
A presidential visit to Taiwan would be such a big deal that it might just prompt China to attack, or do something short of it, like freezing US assets in China or banning all electronics exports to the US.
The only time in history that a U.S. president visited Taiwan was when President Eisenhower toured the country and met with former ruler Chiang Kai-shek in 1960. President Trump's phone call with President Tsai Ing-wen was the first time a U.S. president-elect had directly spoken to a Taiwanese leader since former President Carter severed diplomatic relations in 1979.
A presidential visit to Taiwan would be such a big deal that it might just prompt China to attack, or do something short of it, like freezing US assets in China or banning all electronics exports to the US.