SGR

Just a guess, but Biden called on Congress to pass the CHIPS Act (which he's expected to sign next week) in his State of the Union address. He wants to subsidize domestic chip manufacturing. Taiwan currently provides the vast majority of US microchips. Pelosi's trip could be a way to reassure Taiwan that we're not planning on abandoning them in business relations or arms sales, and by Pelosi not backing down after vague Chinese threats, it also bolsters trust in other alliances of the US with foreign countries that involve arms deals and business relations that may be under threat by other large powers. As it stands, to my knowledge, the US is under no obligation to defend Taiwan in the case of a Chinese military takeover, but it's not off the table. It would have to be approved by Congress though.

In short, my understanding of the motives for her trip, geopolitical advantages.