Tl;dr: Examples in an essay work like world-building in a fantasy novel: too little of them and the idea/story lacks substance, too many and it's weighted down.
John keeps telling me to use more examples in my work and writing, and he's right: they enliven a post, give you a hook for free, and ensure that your idea is deep enough to appear at many different places. Going from "without example" to "with example" is always progress.
Yet I noticed myself overindulging in examples. When writing my last post, I structured a whole draft by presenting one cool example after another, and noting the implications for my general idea. But the examples are not the message! What I wanted to convey was the thesis, the core idea of the post, with examples as illustration and anchors. Instead, I found myself showing off my extensive research one example at a time.
That's when it hit me: I was info-dumping.
The image that came to my mind was a fantasy author so in love with his world-building that he takes every opportunity (and some more) to serenade you about the minutely crafted economic system or the elaborated (and linguistically coherent!) invented language.
The more I think about it, the more I like this metaphor. If I keep it in mind, I expect that my misuse of examples will be obvious, just like I notice info-dumping easily.
Here's a couple of implications: