But a more modern language would benefit from defining some optimizations like inlining as mandatory, the same way tail calls are (and of course GCC has this.) Then there isn't a chance of deploying a build with extra-slow behavior.

That would average out into a few percentage points of performance improvement in every application across the globe which runs on linux / android. Merging a patch like that in linux would be like quietly reaching into every device across the planet and giving them a small, free CPU improvement and drop in power usage. Not game changing for any individual user, but huge in aggregate.

I heard a story - years ago Google hired an engineer who happened to be an expert from a previous life in video codecs. He wasn’t working on YouTube at Google, but out of interest he pulled up the YouTube source code to see what it did. They were just using the defaults for some of the encoding parameters. He tweaked a few of the encoding parameters and in doing so saved Google millions of dollars per year in compute/storage/network traffic. A few hours of his work was probably more beneficial for Google than years spent in his primary role.

And if tuning opportunities like this abound at Google, you know they’re everywhere. It’d be much better if Linux distributions simply shipped kernels which are already compiled with PGO, with a reasonable profile based on normalish use.

The correct answer would've been for ffmpeg to not ship that way.

Anyway, I am an expert on video codecs just like that guy is, and I said what I said ;)