It's not a theory, it's just basic logic, if a whole range violates a strict filter, it can be skipped, no need to generate or check those keys at all.
People who reject this are just ignoring the fundamentals. Filtering entire subranges is standard practice, not some controversial idea.
So why does everyone take sides on this rule and consider it useless at the very beginning of the discussion in the forum, causing the discussion to be fruitless and not continue its process?
That's just how it is; it doesn't make sense. You're free to skip any keys you want, but there aren't any keys that are more reasonable to skip than others