Advisor says the Air's main appeal is thinness and lightness, so thick cases defeat it. They present options: tempered glass screen protector with no case, or with an ultra-thin aramid fibre case as a compromise, or naked at home/office with a thin case when out. They recommend fitting a high-quality glass protector on day one and using the phone without a bulky case during Costco's return period, then choosing protection that preserves the design.