Let us be clear that the notion of "change" being referred to here is forward compatibility, not backward compatibility. The user is commenting on the fact that Rust library authors make use of new features as they become available, and as a result in order to compile Rust code you will often need a recent version of the compiler, or otherwise you will need to find an older version of the library in question.

In addition Rust was born from Mozilla and imitates Firefox's rapid release schedule of one release per six weeks. This does not mean that Rust releases are substantial or that they are traumatizing, only that they are frequent. The contract with users is that Rust releases must be painless so as to not fatigue users and discourage them from upgrading. The success of this painless upgrade strategy is proved by the fact that library authors are so quick to upgrade, as mentioned.

This is in contrast to other languages where historically a new version of their compiler might only be released as infrequently as once per three years. It seems that these languages have begun taking queues from Rust as even Java now releases once per six months.