Outside of US, seeing imperial units is pretty rare. Even UK uses metric for most purposes.

If I am not wrong, US is one of those very rare countries (probably just 2?) which doesn't have measurement units codified as a binding standard, allowing NIST to maintain/allow several different, coexisting measurement systems (for e.g. some measurements are reported traditionally in meters e.g. fabric, metals, rod lengths, but several commercial entities also use foot & yards in their product specifications, even if they are derivatives. This is not the norm usually)

We promised to adopt metric, if everyone else agreed to GMT.

They all adopted GMT offsets, yet we have been quite slow to adopt metric.

Still used in medical contexts

Really? maybe this is a thing that happens only in former British colonies?

Even in other contexts its still present as a secondary measure. For example you would measure area in sq foot for land but sq meters for everything else