I will note that "1GB of address space" might sound like it's not a lot, but on some modern (yes, 64b) systems virtual address space is still rather constrained

I will note that "1GB of address space" might sound like it's not a lot, but on some modern (yes, 64b) systems virtual address space is still rather constrained. E.g. Apple restricts how much virtual memory you can use as an iPhone app (to, iirc, 36b?) or if you're running on top of a virtual machine (e.g. WebAssembly) you might only have a few gigabytes of "physical memory", 4GB for wasm.