You do have a valid point about better husbandry for sure. I'll beg to differ regarding dosing the elements not making a difference though. For my circumstances with what I'm currently doing with my tank, I do no water changes so my only means of now providing the coral what they need to grow can only primarily come from additives like trace elements, etc. So foods contain some trace, but I also do not over feed the tank to maintain NO3/PO4 like some. I feed what my fish need and allow them to graze like they would in the wild. So I also dose NO3/PO4 to keep enough in the system to do my best to avoid dinos, etc. So far so good.
Yes when you are adding things to your tank, it forces you to pay closer attention to details or you'll just kill everything. When I was doing water changes, I did Red Sea for a short time to go through the 500ml bottles and stopped. Didn't really pay much attention at that time was just checking it out. But now that I'm not doing water changes anymore I definitely need to add trace elements or it'll likely be bye-bye SPS. Just have to make sure that in doing so, I pay close attention to what/how I'm going about the process.
At this point for me, it's more about getting closer to NSW levels for parameters. I cannot say definitively that the Red Sea program/NO3/PO4/Strontium dosing regiment that I am currently doing is solely responsible for the improvements in grow that I'm seeing in my system, but I will say that before doing them, some of my SPS just did not grow at all. Those same SPS are now having to be moved around to allow them growing room.
Reason for stopping water changes for me are I can save a lot of money on RO/DI, waste water, salt, and everything that goes along with doing a water change (and I had AWC running with a Neptune DOS with it's own separate RO/DI unit). Also I no longer have to be concerned about mixing the salt, dealing with water temperature, salinity level in RO/DI, dKH swings from bigger water changes, etc. The amount of savings that I'll gain once I finish my current batch of Red Sea and switch to making my own trace elements from readily available products from Amazon/e-Bay, etc. is going to be insane. So far I've spent about $200 (3-4 boxes of salt) to get most of what I need to make my own trace elements. The amount that I purchased will last me years. Comparing that to the cost of salt and water changes every other week or heck even every month are real tangible savings.
With all that said, it really comes down to how your plan to run "your" reef long-term. Do what works for you and stick to it until it doesn't. You want to dose amino acids, dose amino acids. You do not, do not. Your money and time so do as you please and enjoy it while doing so.