The need would still exist. TFA covers the often-overlooked issue of different "kinds" of quantity that have the same dimensions but shouldn't be mixed. Eg. Hz

The need would still exist. TFA covers the often-overlooked issue of different "kinds" of quantity that have the same dimensions but shouldn't be mixed. Eg. Hz and radian/s for frequency and angular frequency. Both have dimensions of 1/time but they're different. You have to be an extreme purist to refuse to use Hz and only express frequencies as angular frequencies. And by the way, if the metric system is so great, why does Avogadro's constant still exist? Since 2019, it's fortunately been downgraded to an exact arbitrary number but it's an ugly legacy of even metric-users refusing to accept change.