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I know you think this sounds like a good reason, but all I can think is that C++'s continues its mutation into a new language and adding to the developer's cognitive load, all for the purpose of a minor performance optimization. In what is already a very performant language.

As usual, C++'s priorities are wrong for anyone who's not writing an OS, web browser, game engine, or otherwise rare type of project.

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I agree with you that evolving languages that have been around for a long time is very difficult, with hard tradeoffs and unclear answers.

I think calling formatted printing “cognitive load” is a bit much though. If anything this is easier to understand and use than stdio and iostreams. It’s closer to other languages in this area. I probably would have voted yes on this if I were on the relevant committee.

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