wellll if you are going to nitpick you ought do it a little more cleanly: you are confusing machine language with assembly for starters, and even at the level of machine code, processors such as the x86 family were designed keeping support for higher level language conventions in mind, so it's difficult to pretend that there is no commonality of stack conventions baked into the microcoded x86 virtual machine.

Concepts you refer to such as "assembly language" exist a level up from bare metal, and at the same level as object libraries, linkers, and loaders and that implies full cooperation WRT calling conventions.