You just proved my point. A programmer who truly knows (a) the machine they are working with and (b) the language they are using will know exactly how to use both in order to deliver intended results.

For example, reading the processor data book to understand it, the instruction set and how it works could be crucially important in certain contexts. I would not expect someone doing Javascript to do this but how many have studied the virtual machine in depth?

Don't confuse being lazy with problems with languages and compilers.