I just had a discussion about this topic. I just report thoughts and facts on the argument
- stack exchange sites is an international, worldwide community.
- the point of a worldwide community is to be able to communicate easily among different cultures, countries, and experiences.
- on some sites, some countries are probably highly represented, most likely USA and Canada
- in such highly represented countries, non-standard units are used.
Now. when it comes to so-called customary units, such as spoons, or cups, they are non standard but they are, within a reasonable approximation, the same for everyone. They are also easily available in the cooking work environment, namely the kitchen. Things change when we talk about lbs, stones, or Fahrenheit. These are non-standard, non-customary, non-metric units that have sense only within a particular community, which also happens to be highly represented, but not the only one on this site.
The point I want to make is that, for the sake of interoperability, community wellness and growth, most of the people on SE sites are already respecting a de-facto standard, which is the English language, instead of their own native language. So, for us non-native, an effort is already made to use a de-facto standard. It would be kind that those people using non-standard units also provide a small effort as well, by providing the information (as an addition) in a worldwide adopted standard, the metric system, when describing procedures, temperatures and quantities. It would scale well, demonstrate an effort, and allow US/Cad/UK people to learn the metric system easily.