I think most large scale projects, or those with special requirements (things like embedded systems) are defining what subset of C++ they are ok with. Here are some examples:
Large commercial projects. The problem is the mid sized projects, especially FOSS ones, there isn’t the time needed to curate every pull request and bikeshed. There is also something to be said for having less abstractions, moderately wet code can be easier to follow and fix than needlessly dry code.