Ultimately, this community is about you, the members. If you're not happy, you won't want to stay. With that in mind, please answer the following: Are you interested in photos/articles that are not strictly about Aquaponics, ie; ponds,etc.
I agree with David (To a point) If a post or article is deemed useful to AP even if not directly about it then it should be allowed. We have categories that people can easily find what they want and avoid what they don't. Some of the best things I have done were inspired by other types of setups ie ponds, hydroponics, etc. It would be a shame to miss out on these useful points of view.
An example is the venturi tee I started making was based on pond aeration videos I have seen and discussed ages ago here. Setups that are nice and clean but still utilize fish waste as nutrients were inspired by some great hydro videos I have seen and would share here as well.
In the end it's up to the group owners to decide what's relevant or not but that is my 2 cents... which is actually priced well above what it's worth.