[faeyanpiraat]

The issue with recipe weight unit conversions might be that the author literally had a cup or spoon or whatever with a specific capacity which would not equal the standard units, therefore you are converting one inaccurate amount to an other one.

[wheels]

I'm not arguing in this case that it's more accurate, just that it's sometimes easier: if I've got a mixing bowl on a scale, I find it easier to pour things in by weight rather than to measure them all out. On recipes I often cook, I edit / write in the weight in grams to speed things up.

[delecti]

It's safe to assume any recipe written in the last 50 years is using the standardized units. It isn't literally 100% true, but close enough that it's not worth worrying about.

[robbiep]

If that’s the case, then the issue is immaterial