Ah okay. I thought you meant numerical changes, which would be reason to not trust a language.
Mathworks has broken some legacy support in the past, but they have slowed down on that practice. They used to threaten that dll loading would go away “in a future version of MATLAB” but have since backpedaled on that. My biggest issue is writing code that leverages cool new features (especially timetables) but some people I work with never update their IDE.