[randomdata]

> that only works if enough places in the code add context.

It would be a bit odd to not add context, wouldn't it? Same goes for any value. This is not exclusive to errors. If you consider a function which returns T, the T value could equally be hard to trace back if you find you need to determine its call site and someone blindly returned it up the stack. There is nothing special about errors.

While ideally you are returning more context than Errorf allows, indeed, it is a good last resort. If your codebase is littered with blind returns, the good news is that it shouldn't be too hard to create a static analyzer which finds blind returns of the error type and injects the Errorf pattern.