Plus, a lot of new library and language features are simply standardized versions of features that mature codebases had their own solutions for years, so "upgra

Plus, a lot of new library and language features are simply standardized versions of features that mature codebases had their own solutions for years, so "upgrading" to a newer C++ may also imply a long process of deprecating these alternatives in favor of standard ones, and the subtle differences between the two can expose new bugs and issues.