I think it qualifies as taking the hobby to the next level......
Im an old schooler. The more strraightfoward the better.
But, I travel alot. On a good year, Im gone about 200 days. A controller gives me the ability to access anything plugged into the system, while I'm traveling. Any light, pump, filter, fan, heater, etc. From my laptop. Or my iphone. I can access all programming from anywhere in the world, but the beauty of the controller itself, is that once you program your specific parameters into the controller, the controller does all the work. If my tank goes above 84degrees the heaters are bypassed and the fans and airpump kicks on. If it doesnt come down in a certain amount of time, it'll kill the lights as well. The heater controls are much more focused too. Far greater acuracy using the controllers thermostat.
Once my tanks online, I'm emailed anytime the controller makes a "change" to deal with an issue, like the example above. Any change in the temp or ph and im alerted. Anything malfunctions, like a stuck heater, it'll cut it's power and shoot me an email. Once i setup an auto water changer, the controller can monitor the tank level via a float switch. It can add it's own water as needed. I can do water changes from my phone, or better yet, program them on a timer to automatically do them every Sunday at noon.
Lighting options are pretty cool too. Not sure how deep Ill dive in, but the controller gives you dimming control with the appropriate lights. Seasons can be simulated as well as cloud cover. Storms lol......... its a little ridiculous
My wife and daughter are sympathetic to my hobby(addiction) and love the fish, but they are not fish people. Technically, I could program feedings too, but they really like feeding the fish,...... If I can build a system that gives me total access and control from anywhere in the world, for me , it's worth it. Even for freshwater.
And for salt a controller can do so much more....