For essentially the same reasoning for having "include-url", I've seen multiple customers bypassing Discoverd and creating their new-suspect generator because of the lack of flexibility for exclusions.
Right now, you can only have "exclude-range". There is no discrete way to exclude things like there are for inclusions (a.k.a. "specific").
For these reasons, many customers will benefit from having the same flexibility that already exists for inclusions to exclude things from auto-discover.