Keval Desai judges products by what he calls the toothbrush test, an idea he first heard from Larry Page at Google, asking whether something could become a daily habit for millions of people, and he applies that same thinking to unexpected areas like autonomous freight. He also talks about what he calls the Imagination Era, arguing that as AI takes over more routine work, human value shifts toward imagination and judgment, and he often explains these ideas by pointing to older tech history, like comparing open-source AI to Linux or drawing lessons from Sun Microsystems.