ABI compatibility is one of those things that is necessary with such a long history, especially with commercial libraries that don't really have an equivalent in the newer languages. The issue with C++ that doesn't exist with it's competitors is that there is a long tail of software people use commercially that isn't source available that's incredibly important in certain use cases.

I worked in a previous role on C++ CAD/simulation software that required vendored things like solid modelling kernels and it was incredibly painful. Occasionally one of the vendors would just not do the work and you'd end up having to spend half a year ripping out the dependency that worked perfectly well. The team working on the software were generally in favour of moving up through to modern standards, while I was there we did 03 -> 17 for e.g. but that didn't finish til 4 years after the C++17 standard came out for all sorts of reasons. When VS2017 came out everyone breathed a sigh of relief because suddenly we didn't have to wait to upgrade the compiler.