@root42 Embedded compilers are often trailing; we only just recently upgraded to a C++17 compiler at $DAYJOB. Can't get much further with the current hardware we're targetting as the CPU isn't supported by newer GCC or GLibC...
And there's also the thing about being mentally stuck to the version of C++ one learnt. I learnt C++ back in the late 1990s, and I still have some old code written from before namespaces that I just tacked "use namespace std;" on to be able to compile... 🙂