On your last point, even just a language like JavaScript (or even Java) has, over long enough periods of time, evolved to accumulate enough new features and common idioms that if you look at typical code from the 90s vs now in those languages, it's not hard to picture entirely different languages. And engineers are expected to just learn the new changes and keep on, much as they're expected to just learn algorithms, libraries, test frameworks, other domain specific frameworks that come and go, database stuff, profiling and other monitoring methods, security concerns, how not to violate the GDPR, ....
But suggest a different language or a DSL for something, no matter how much sense it makes (sometimes getting simple SQL in places is a political struggle, and it's unfortunate when teams develop a "regex expert" even though all the regexes are simple), even one that is already super similar to one they already know like GDScript and so is rather trivial to learn (no one's asking you to learn something on the order of complexity and different-to-others like Haskell here), and devs start putting their foot down and saying "Of all the things, I"m not learning that!"
