I think one of the principal reasons for that is that there are many ECs who are not aware of what their by-laws say, or if/when they look at them, they don’t know what they mean. So in this example the EC may well think that the by-law gives them the right to simply refuse permission for an animal.
You can’t write a by-law requiring the CTTT to do something like remove an animal. The CTTT isn’t a party to the by-laws, and they don’t have the power to remove an animal. They can issue an order on an application for an animal to be removed, but that’s the limit.