like for instance of attached bolt drawing....
It also comes down to the level of detail required, as shown this is a pretty, but useless model.
It all comes down to "what level of detail and or accuracy is required?"
If it is like a General Arrangement drawing then general shape and size are all that is required, yet they do need to be dimensionally correct.
If it is a final assembly, and or details used to actually manufacture and or fabricate parts/components, then the level of accuracy needs to go up accordingly.
Yeah, that is a nice bolt, however probably too high a level of detail unless for manufacturing purposes.
It is also probably too detailed even for an assembly diagram.