Marques Brownlee reviews the Oppo Find N5 foldable phone, focusing on its remarkably thin design and large screen size. He discusses whether the "book-style" foldable phone design has reached its potential, noting its advantages in multitasking but acknowledging limitations compared to tablets due to its square aspect ratio. Brownlee highlights the phone's impressive specifications, including its powerful processor, large battery, and bright displays, but also points out potential overheating issues. Ultimately, he concludes that while the phone represents significant advancements in foldable technology, the square screen format presents a persistent challenge to widespread adoption. The review emphasizes the ongoing evolution of foldable phone technology and its niche appeal.