I started meddling with visual range and guess what?
I found that standard visual range is 50, max is 100.
But wait! Ranged weapons has up to 100 in range but it will not auto-attack (manual is possible) at anything beyond 50 .... Why do we get longer ranged weapons when it does not auto-attack and we are limited to standard 50 visual range?
Why all the restrictions, I wonder ...
It is like owning an electric car that has a battery charge for 200 miles but the AI in your car will not allow you to drive when mileage hits 100 and demand recharging !!