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I stoped using Spotify when they committed the unforgivable UI sin of "loading a page and then moving elements on that page when web calls complete" that resulted in me clicking on something other than what I had intended to because it changed with my thumb a nanometer from the screen. It was a good 20% of the time and it made me insane.

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I guarantee that was some A/B testing and moving elements around drove what was technically engagement by 0.03% more. The best kind of engagement.

I think this explains why apps shuffle the UI around every now and then. I build muscle memory to access particular functionality fast, then update comes, I click the wrong thing, and that technically speaking is measured as more engagement.

This is the scourge of the modern internet. Even Google does it.

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