Your argument falls flat when a page file can be multi-GB and automatically grow. And if your application admin was competent, memory monitoring would be part of the application monitoring stack.

An application that grows in such a way (besides having backing stores for memory-mapped files, as well) will often perform so poorly that it requires addressing (adding RAM, looking for application faults, etc).

A page file is insurance, one that can last you much longer than available system memory.

> memory monitoring would be part of the application monitoring stack

You don't need it if you have everything allocated upfront. TigerBeetle does this, everybody else can.

Using something like Rust is already a huge win when compared to shipping a browser or running Node.js.

> Your argument falls flat when a page file can be multi-GB and automatically grow

This doesn't solve the original issue and only masks the underlying problem.