Half-serious reason: because with each C++ version, we seem to get less and less what we want and more and more inefficiency. In terms of language design and compiler implementation. Are we even at feature-completeness for C++20 on major compilers yet? (In an actually usable bug-free way, not an on-paper "completion".)
The compiler design is definitely becoming more complicated but the language design has become progressively more efficient and nicer to use. I’ve been using C++20 for a long time in production; it has been problem-free for years at this point. It is not strictly complete, e.g. modules still aren’t usable, but you don’t need to wait for that to use it.
Even C++23 is largely usable at this point, though there are still gaps for some features.
Funny how gcc seems to be the top dog now, what happened to clang? Thought their codebase was supposed to be easier and more pleasant to work with? Or maybe just more hardcore compiler devs work on gcc?
Feature complete is a pretty hard goal to reach. It sounds like "added all the features" but is closer to "bug compatible across compilers" (not saying there are bugs just that recent versions have removed a lot of wiggle room for implementations)
Also modules was a lot and was kind of the reason it took so long. They are wonderful and I want them but proper implementations (even with many details being implementation defined) required a lot of work to figure out.
Most of the time all the compilers get ahead of the actual release but in that case there were so many uncertainties only rough implementations were available beforehand and then post release they had to make adjustments to how they handled incremental compilation in a user facing way effectively.
