Helps the discussion to bracket possibilities. If there's an absolute hard limit somehow, let people know so they don't assume it's possible to go further. I f

Helps the discussion to bracket possibilities. If there's an absolute hard limit somehow, let people know so they don't assume it's possible to go further. I find this useful in discussing solar power: there is an absolute maximum of 1300 watts per square meter; most people don't know this and implicitly assume substantially higher is achievable.