2) Taiwan does not represent unprotected border territory. Heck, attacking it sustainedly would require significant and slow naval logistics
3) Other than human intellect, there is little in the way of natural resources to obtain out of Taiwan. It's economy is manufscturung and export driven.
Other than some nationalistic pride to recapture teritority, they are not much alike.
To add, Taiwan uses traditional Chinese and is more conservative to traditional Chinese culture. China abandoned all of that during the cultural revolution. There's been a recent nationalist push to embrace "traditional" Chinese identity, involving mainand Chinese people going to sites in Japan and elsewhere wearing "traditional" Chinese clothing. Imagine the nationalistic outrage if someone wore a kimono in China. In practice, these traditional Chinese clothing are cheaply made cosplay from Taobao
Existing US land and sea based nuclear weapons could hit targets in China in a matter of minutes. Being based closer to China/Taiwan might shouldnt matter in the age of ICBMs.
Why do people keep spreading misinformation?
E.g. Taiwan grows and produces some of the best tea and coffee in the world. High end tea leaves costs more than some stock grants here. China tried for years to replicate it and has some success but definitely still far off.
Taiwan is renown for many things - not just semiconductors. It's just you might not know about it. A lot of your every day life might have something to do with Taiwan.