I think about some aspects of interface design as sugar.

This is how you adjust the photo in Photos app in the previous version of iOS:

And this is the same view in the current version:

The difference is in the delayed/​animated falling of the notches.

I don’t think it’s great. It’s “delightful” in a rudimentary and naïve sense, but like sugar, you cannot just add it to your daily diet without consequences. This extra animation serves no functional purpose, and the sugar high wears off quickly. What remains is constant distraction and overstimulation, the feeling of inherent slowness, and maybe even a bit of confusion.

It pairs nicely with the previous post about avoiding complexity and rewarding simplicity. I often see this kind of stuff as related to designer’s experience. Earlier on in your career, you are proud you’ve thought about this extra detail, you’ve figured out how to make this animation work and how to fine-tune the curves, and you’ve learned how to implement it or convince an engineer to get excited about it.

Later in your experience, you are proud you resisted it.