Can you elaborate 1) why you can't r/w atomatically from a progress variable (even if it's a byte?), 2) why are we writing Python code for 8-bit or 16-bit machi

Can you elaborate 1) why you can't r/w atomatically from a progress variable (even if it's a byte?), 2) why are we writing Python code for 8-bit or 16-bit machines, and 3) why is it bad to take advantage of our language's guarantees on execution, e.g. with Python and JavaScript?