Well, can't really blame them in 2012. Especially that C++11 did bring an ABI break. Looks like they keep it fresh, although C++17 is getting a bit dated. Migration from C++17 to 20 or even 23 is probably a breeze though compared to migrating 03 to 11.

IIRC it wasn't just the ABI break that was a problem, it was the fact that they wanted to build on systems that didn't have a C++11-compliant compiler available yet.