I just was frustrated by the "mind rot" comment, clearly is saying I'm too stupid to do it their way. For studio work I use manual strobes and for lab type conditions, would do the same. I've been a photographer for 35+ years so yes, I understand how to use a manual flash.
When used correctly, TTL flash is not unreliable/unusable and I've taken hundreds if not thousands of macro shots over the years with film and digital using TTL flash and never had an issue that wasn't an error on my part. I suppose maybe some models or brands might not work well, but both Olympus OM and Nikon TTL flashes works great IF the user knows how to work with it. I do a lot of event photography and use exclusively TTL flash in that environment and it works perfect. BUT you do have to know how to use it and there is more to it than setting the camera on P and turning on the flash. There are times when a manual flash makes sense too.
Anyway, good luck with your adventures into Macro.