For all of my projects it is good enough. C++11 onwards has a few advantages, but I don't need them. Moving ownership between containers to avoid allocations was possible with the standard library even before C++11, and Qt offered "implicit sharing" which has a similar effect without syntax changes and incompatibilities. Even with my C++11 projects (e.g. https://github.com/rochus-keller/eigen/) I had to take care still in 2024 which feature not to use on MSVC because it didn't work or behaved differently. I never have any ownership issues and I implement large compiler projects with different AST and IR layers. All my projects still compile with https://github.com/rochus-keller/leanqt/ on all platforms. I would never trade a tiny language advantage with a whole world of dependability issues. One day I will revive and refactor GCC 4.7 to get a cross-platform C++98 with parts of 11 compiler just written in C, then latest all of my software is buildable "from first principles".

PS: it's funny I wrote my comment three days (and not an hour) ago.