[ncmncm]

It can't shed the old stuff, but it is very, very suspicious -- smelly -- when any of it appears in new code.

[shadowgovt]

It's smelly if you have enough people on the team to know what new code versus old code smells like.

If your developers are coming to the table with some C++ tutorial books written a decade ago, good luck. Invest in a decent linter and opinionated format checker.