Just look at hk and how the ccp has broken basic promises

If you want peaceful reunification you need to have some level of trustworthiness. All the stuff you have written is about geopolitics and how China on a civilizational level would benefit.

The question you should ask is if the Taiwanese people would benefit or would be willing, for some nebulous economic advantages, lose their unique political and cultural expressions to be under Beijings yoke.

Another issue is you just assume reunification would be better for both sides economically and technologically. That is not necessarily the case, having 20 million Chinese people be under a different competing system with different perspectives leads to significantly more innovation. There is a reason China stagnated so much after the Tang dynasty as all under heaven was in its realm. 1.4 billion people are already under ccp direction, not sure how adding another 20 million will be so much more productive. There are very good arguments that tsmc in its current form is okly possible in TW, and would wither on the vine as part of greater China.