[rhaway84773]

Rust, which is the greatest new hotness in the backend world is from 2015.

Other major languages in the backend world are at least 2 decades old (C#, Java, Python, C++, Ruby, etc).

C# with the .Net framework is an interesting example. Microsoft realized their original windows only approach was a dead end. They created .Net Core. But someone moving from .Net framework to .Net core didn’t have to relearn much at all, beyond initial config/bootstrapping, and which subset of the APIs had been implemented, because MS completed the implementation in stages.

On the flip side you have React, where you’re ostensibly using the same library for a decade, except halfway in between they made a change which completely flipped how developers weee supposed to use the library.