So - the challenge for a well-meaning traveler who has passed the AIT interview and now has a B2 visa and now simply want a short visit with a U.S. citizen spouse in the U.S. is in convincing CBP officers, who are law enforcement officers, and who are lied to day in and day out, that they have no plan to work or overstay their visa.
They need to prepare the same type of documentation for CBP that they took to the AIT interview that speaks to the person’s need to return to Taiwan after a short trip, including a letter from an employer stating the position and length of employment, and the employer’s expectation that the employee would return to work in Taiwan after the short trip. If they own sizeable assets in Taiwan, e.g. real estate, car, etc., then documentation of those assets. They should avoid carrying information on job-hunting or house-hunting in their carry-on bags - CBP officers have the authority to require a traveler to empty their bags in front of the officer. Also, nothing on FB or other social media about “moving to the U.S.” or similar statements inconsistent with a plan to take a short trip.
Lastly, if they are admitted entry into the U.S., they should not max out the time they are allowed for that visit, so that a CBP officer inspecting (interviewing) them on a subsequent visit is less likely to think that they’ve abused their visa privileges in the past.
BTW, my experience in based on seeing lots of people come in for a short trip on a B1/B2 visa, probably had no intent to overstay, and not being prepared for some questions that had to be answered correctly.