My view on this has flip flopped several times during my career. I think every spec has some dusty corners that most people don’t know about, but when a situation calls for it knowing about some obscure features can make your code far more readable. Sometimes it’s better in the long run to train your team about a feature they might not know about rather than code for the lowest common denominator. This thread is a great example - I spent my first decade of programming scared of chained terneries. One day I spent a couple of hours goofing around with them, playing with different ways I could write my code and internalising their semantics. Now they seem fine. I wish I’d taken the time to do that years ago. Ten years being afraid saved me 2 hours of time learning.
One of the best programmers I worked with reads the specs of tools he uses for fun. He says specs seem daunting but you can read them in far less time than you think and there’s always some fascinating stuff in there. My HTML knowledge got way better working with him - and its funny seeing how many tools struggle with correct HTML because the authors didn’t bother actually learning it.
Some more examples: html void elements, html/body tag auto insertion, JS tagged break/continue, C/JS/etc’s comma operator.
If something is so detailed that it gets too long to be quickly readable I extract it into a separate properly-named function.
I'm definitely drawn to using all the tricks of a language and I feel like it would be a great way to show off how smart I am, but I'm not sure its worth it for sacrificing comprehension and ease of adding stuff in later. Maybe if everyone that will ever work or use that code is top-notch, that would be a dream.