BSA - Insufficient explanations.
Idea: a test = a WEB page detailed and understandable by all the worlds (with image).
BSA - the instructions of 2019 are even less clear than those of 2016, which were already less explicit than those of 2012.
Although there is one URL per test, the explanations are often not understandable. Sometimes the error (or suggestion) seems to indicate something that already exists. Maybe it's the mistake itself that is not clear. In this case, I suggest images that will be more talkative than words (often poorly translated).