You've missed the point. He isn't advocating for everyone to suddenly use JPEG where they wouldn't before. He's advocating that, since there are so many JPEGs already in use, the architecture for displaying them should avoid unnecessarily converting them into RGB 32bit, and instead display them without conversion in a YUV 420 format, to align with the internal encoding of JPEGs which is YUV 420.
Essentially, rendering JPEGs directly as a GPU texture (since GPUs can already natively use 420 encodings for textures). His point is that this would improve performance, very slightly improve quality, and reduce power usage as there's no colour space conversion.
Essentially, rendering JPEGs directly as a GPU texture (since GPUs can already natively use 420 encodings for textures). His point is that this would improve performance, very slightly improve quality, and reduce power usage as there's no colour space conversion.