The C++ Standards Committee has been prioritizing ABI compatibility at the cost of performance for the last decade or so (mostly in the standard library, as opposed the language itself, as I understand it). Some people (especially people from Google) have been arguing that this is the wrong priority, and that C++ should be more willing to break ABI. See:
https://cppcast.com/titus-winters-abi/
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p186...
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p213...
Disclosure: I work at Google with several of the people advocating for ABI breaking changes.
