There is a remarkable difference in Jony Ive's approach towards design and Dieter's despite of his inspiration (OSX calc, iPod, etc.). For e.g., Dieter truly explored texture of the surfaces not from an aesthetic goal, but as a tool to aid functionlism (knobs have knurling, sliders have striations, grippy things had rough texture, areas that shouldn't be touched were gloss). Jony just made things beautiful that sold well because that's what sells. That's what luxury brands do.

He threw away the german functionalism that Dieter is so well known for, and adopted the hollow aesthetics of his work. Jony was obsessed with how a thing looks more than how a think works (besides the fact that Apple mouse is horrendous to use, it at one point had a charging port under the mouse). He ignored and still to this day ignores ergonomics, transparency, affordances, feedback and many aspects of design that are fundamental to designing a product that interfaces with humans. Instead of looking up to the challenge to make products more usable whilst keeping a consistent coherent aesthetics, he prefers to hide things or flat out omit important features so that the design is clean. He almost had an authoritarian role at Apple - engineering had to bow down to him.

About the only thing Jony Ive did with Dieter Rams was adopted minimalism for the sake of aesthetic goals. Dieter would never design a clock that had a transparent face, made legibility poor and had white numerals on clear glass (which does not guarantee contrast): https://watchesbysjx.com/2013/10/jaeger-lecoultre-newson-atm...

Jony Ive IMO is one of the worst designers in modern history despite of his success.