Those decisions aren't made by publicly disclosed Q&A sessions as much as one may believe in that being how their system functions. The US is not having serious public debate about this even if it seems like a few people are raising the topic. Their conclusions would be obvious anyway. Unless those involved in these discussions understand the full extent of US military capability and China's, they wouldn't have any means of arriving at well informed reasons and decisions.
Is PRC even really intending to invade the island? I have doubts. Even if such a strategy was winnable for PRC, they have very little reason to upset their upwards climb. Taiwan is not posing a military or economic threat. PRC has made the red line clear - US military in Taiwan (en masse or with intention to settle) and Taiwan declaring independence. If those aren't crossed (and they're reasonable conditions from PRC's perspective) then there is no point risking China's development and military to invade and retake the island when they could do it in years/decades time hopefully peacefully as PRC and ROC both continue to transform and hopefully converge even further. If that doesn't happen, at least PRC will have an even better military means of reunifying the country, which pushes towards peaceful reunification anyway... something some Taiwanese aren't actually that opposed to especially as China continues to progress. It's just not popular to express neutrality in Taiwan about this. It's like talking about certain things in the west where you gotta walk on eggshells and some unpopular opinions are very much socially unacceptable.
So for PRC, winnable is there but comes at the cost of who knows how much. For the US, it's a doubtful one whether it can stop the island from being reunified. Whatever it commits, the cost is unknown as well. Those who know the specifics won't be publishing the information or talking about it so openly.