Rarely that's ever true. Hardware and software assumption will change over time. E.g. Simd is rare and not available to 99% of hardware has it, pointer is 16/32

Rarely that's ever true. Hardware and software assumption will change over time. E.g. Simd is rare and not available to 99% of hardware has it, pointer is 16/32/64 bit wide, that API is available, SGML/JSON/XML is all parsing you will ever need.