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>>jsnell+(OP)
> However, contemporary applications rarely run on a single machine. They increasingly use remote procedure calls (RPC), HTTP and REST APIs, distributed key-value stores, and databases,

I'm seeing an increasing trend of pushback against this norm. An early example was David Crawshaw's one-process programming notes [1]. Running the database in the same process as the application server, using SQLite, is getting more popular with the rise of Litestream [2]. Earlier this year, I found the post "One machine can go pretty far if you build things properly" [3] quite refreshing.

Most of us can ignore FAANG-scale problems and keep right on using POSIX on a handful of machines.

[1]: https://crawshaw.io/blog/one-process-programming-notes

[2]: https://litestream.io/

[3]; https://rachelbythebay.com/w/2022/01/27/scale/

>>mwcamp+0v
A lot of these are FAANG scale problems primarily when it comes to server/backend infrastructure.

For a lot of "embedded" use cases like robotics, where you are trying to squeeze out maximum performance from a single machine (the hardware you have on the robot), POSIX is and will remain a hindrance.