I think it's cool if people want to spend the money for an in-line chlorine filter and do the maintenance. But hope they don't rely on it 100% and assume it's working, or how well it's working. So imo all the same safe guards should be kept in place. Owner's choice though of course. I just happen to prefer butt simple and cheap.
Ammonia binders are indeed very safe. However, when dealing with a pond that has no history of testing so I have no idea what's going on I don't want to be the first in line to tell people this stuff is perfectly safe. I do know there will always be a line of people around the block to tell people things are safe. I know a little about ponds, but there is a ton of stuff I don't know. I don't know the exact product the poster have tossed in their pond, almost never do. Some products don't disclose ingredients. When ingredients are disclosed and there are things like copper and ammonia in the pond I don't have the education to know how all the chemicals in specific dechlorinators and ammonia binders interact with the copper, ammonia, pH, O2 level, at the pond's current temp and pH (which are always unknown in these threads). I do however know a a little. Like these products can effect pH. Now if I knew the KH I'd be less concerned, but I never do in these threads.
If there really is high toxic ammonia and not a false reading, then of course an ammonia binder is useful.
I'm just not personally willing to stand up and say it's perfectly OK to keep dumping stuff into a pond...especially with no water quality test results, not even water temp when there are safer, easier, cheaper, less stressful alternatives. I do understand that is not a popular position in forums, but that's OK with me.
The problem is I just don't have the trust in many of these products most people have. The front of the bottom says "Fish Safe" while the MSDS, hidden in the back and only published because it's required by law, gives a much different picture. Or they don't even have to say what's in the bottle so they don't.
There was just a thread here (I think) of someone using Microbe-Lift, a completely fish safe product, says so right on the bottle. All or most of the fish dead in about an hour. Now I'm not entirely convinced that product was responsible, but it does look that way. Maybe there was also something else going on in the pond that helped cause the problem. I don't know. After reading many stories like that in forums for the past 20 years I'm just a little more skeptical than the average bear.
When I don't have a good idea what's in a bottle, or have a serious need for a product, I don't use the product. And I feel even more uncomfortable telling other people the product is perfectly safe for their pond. Especially when the fish are already, or could be, in serious trouble. We already have an entire pond industry setup for doing that and they sure don't need my help.