Carousels, Accordions & Pop-ups are the protagonists of the Web's Horror Show: they are easy to implement, easy to break and are guaranteed to create tons of accessibility, SEO and performance problems. They are hated, mocked and doomed by UX and Accessibility experts. They are loved, cherished and embraced by the rest of the world.
Even if we, bazookas under each arm, would like to annihilate them, they remain popular with our colleagues, marketeers, managers, customers and CEOs. And sometimes rightfully so: there are reasons why you should keep using them.