The Scala community is incredibly committed to stability; every open source maintainer I know of in that space checks for binary compatibility when releasing as well as cross-compiling for multiple targets (Node, Web, Native) and versions.
The problem with scala is that the core devs seem to be working against what the community wants. At it's core it's still a research platform for many and it shows in the priorities for what gets included in Scala 3. Also while individual open source libraries are generally very stable and high quality the overall ecosystem is very fragmented and there is lots of churn (cats vs zio holy wars etc.).
