> With compilers there is a (roughly, barring optimizations) 1:1 correspondence between input and output.

Maybe if you are using a compiler to provider a portable assembler (i.e. C) where ~1:1 mapping is the whole point. But in that case you'd be actually be using assembler instead in a world where all CPUs were the same.

That is very narrow view, though. Often — and I'd say most often — people use compilers so they can think in higher levels of abstraction, like SQL. Taking SQL and adding millions or billions of additional keywords doesn't really change anything with respect to the concept. Its still the same thing at the end of the day, even of those millions/billions of additional keywords are much more powerful than a small set of keywords.