Jony has hit a plateau in his design philosophy. What was new, fresh, and revolutionary in its usability and simplicity starting with the iPod at the turn of the century is now looking quite dated. The overall design peaked with the original iPhone back in 2007. You had a couple of evolutions that stood out (the glass iPhone 4 and the monolithic slab of the iPhone 5, the flat design of iOS 7), but overall the design progress has been lackluster over the last decade.
Many articles about Jony focus on what he accomplished in the early days of the iPod and iPhone. There may be some about the "spaceship" design of Apple's campus, but there simply hasn't been much progress on Apple's actual product design in years. At this point Jony is like Tiger Woods. He has done a tremendous amount in his field, but his best days are likely well behind him. We hope for a comeback, yet when it really comes down to it all that gets talked about is accomplishments from years ago.
The iPhone X is probably the most beautiful iPhone designed (edging out the 4), and the matte black iPhone 8 isn't far off. You can make a claim that design trends are moving away from the Ive-Braun philosophy, but what is being produced from a design and materials perspective is still fresh IMO. The iPhone X doesn't feel like a tech product in-hand, it feels like a classic, high-quality appliance. That is a major accomplishment, and that's absolutely part of the design process that Ive was surely involved with.