I think you’re overestimating how much needless animation helps sales and underestimating how many people are negatively affected by it.

20% of the population has high sensory sensitivity. Many of these people have issues with needless animation. Some people with ADHD also have issues. When you add them all up, it becomes a significant customer base. And even for neurotypical people, excessive animation is distracting. They’re able to tolerate it, but it’s still adding cognitive load.

And it’s been shown through usability studies that carousels are terrible across the board. Marketing people like them for some reason, but there is almost never a good reason for a carousel on the web. Marketing people and some designers like animation because it grabs your attention, and it gets a “wow” in a presentation to executives, but I’m not convinced it actually increases conversions.