Most implementations are massively bloated as a legacy from the jQuery days when that was neccessary. CSS is incredibly powerful now, and the browsers are all evergreen, so it's pretty trivial to implement a pure CSS/HTML gallery:

https://css-tricks.com/css-only-carousel/

This is fully featured, with indexing, scrolling, animation, etc., but you could slim that down even further to just a few lines for a simple automated slider. Obviously doesn't work if you need managed control, but 99% of gallery use-cases are just flipping through a homepage hero like the OP.