> All procedures that returned allocated memory will require an explicit allocator to be passed

All procedures in core/os. Odin isn't removing the allocator from implicit context in the rest of its APIs.

I'm guessing it's aimed at game development since Vulkan has a similar pattern in every function call (although optional, the driver does it's own allocation if you pass null).

How do you allocate memory without an allocator?

All you've got to do is write `context.allocator` to abide.