I can only speak for North America here, but it may be interesting to note that in a stock market context (as well as regarding production schedules), backlog isn't a tautology either. An example:
"We have four key criteria...Second, we seek those that are resilient because of exposure to a customer or technology that’s doing well, a strong order backlog, or very low operating leverage."
You couldn't talk about a "strong" order backlog if it were a drawback. These orders haven't been processed yet, but that doesn't mean they are overdue.
Cf.
https://www.accountingtools.com/articles/2018/1/15/backlogOr:
"We are pleased to once again increase our 2018 annual guidance expectation. As reflected by our record backlog levels, we have strong visibility for continued growth in 2019 and beyond."
https://www.marketscreener.com/MASTEC-INC-13638/news/MasTec-...Surely, people wouldn't be touting their companies' record levels of backlog if it were something bad.
Best wishes