It comes down to familiarity with China's pattern of military pressure tactics, as well as a general alarm fatigue from decades of exposure. Many Taiwanese see the Chinese military display as more of a show than a preparation for an all-out invasion. There are several reasons being China's "show of force" in recent days, pointing to short- and medium-term goals. Domestically, the military pressure serves Chinese President Xi Jinping's propaganda and political agenda. Xi's defining political idea is promoting the "China Dream" to his people, which partly entails becoming "a strong nation with a strong army".
China had just had its National Day celebration on October 1, and a public show of force is a visual embodiment of that narrative. China's nationalist Global Times newspaper even went so far as to call the flight incursions a form of National Day "military parade".