What are programming languages for? This might be a silly question, but bear with me for a moment.
Most programming languages try to be at least partially general-purpose, but the languages that tend to grow popular are the ones that work well in an area where existing languages do not. C’s popularity persists because it’s still one of the few languages that lets you—forces you, in fact—to drop down to a low level and root around in the guts of the computer’s memory yourself. C++ carried that forward from C, but added more complexity, allowing people to create structure in larger software systems. Java took that object-oriented large-system-structure approach even further, but divorced it from the low-level programming of C and C++, running programs on a virtual machine that acts the same on a wide variety of hardware, at the expense of some performance. And then you even have environments like Node.JS, whose selling point was web development, where asynchronous programming is important and allowing people to use a single programming language in both the front end and the back end was desirable.
Many of these decisions stemmed from the kind of things each language was optimizing for: low-level programming, hardware agnosticism, easy transition by web developers, and so on.
But if you go further, into the less-widely-used languages, you find some interesting cases where people are optimizing for other things. Rust optimizes for safety while trying to retain as much performance as possible. Haskell and its powerful type system tries to make sure your program does exactly what you want it to do and nothing else. Prolog is an attempt at making you tell the computer precisely what you want, and letting the computer go and figure out how to do it for you.
So here’s a question: how would you design a feature for a language meant for live presentations?