Reasonableness is an objective test, taking into account the circumstances of any given situation. There are lots of cases on whether a decision is reasonable or unreasonable, in strata the most obvious being the keeping of pets. What is reasonable will change depending on each situation.
The problem with including a list of what is reasonable is you are not allowing for any discretion and leaving yourself open to challenge. It is far better to be silent on what may be considered reasonable, and deal with each case on its merits. The other thing is the example by-law puts the onus on the person to seek approval, and has consequences where they don’t, which is what you want.
It’s a good by-law, the only thing I would add to it is a timeframe for responding to a request.