Personally, all of what you wrote is a benefit when it comes to release notes. I don't want flashy GIFs, words written by non-programmers who don't actually understand what they are writing and I definitely don't want the marketing/web design part of a company to be involved in it.

Simple, tell me what changes, where I can read more and that's it. It's the perfect release notes.

But, as always, people like different things, as is apparent here :)