It's a hobby. You can go as far down the rabbit hole as you might want. Nothing wrong with a basic tank with regular water changes, but many of us want to go a bit further down than that.
I'm an automation developer... was never interested in adding a computer controller to my hobby, I do that for a living, thanks, don't really want to deal with automation as part of my hobby.
My latest build, I needed two timers for my T5s, one for my Ref light, wanted a safety backup on my heater... Picked up a RKL unit. Got all of that, not much more than 3 decent quality timers, really. Ended up adding a second PB4, so that I could run a pair of wave pumps, added a solenoid to help make my ATO system a bit safer, plugged my skimmer in so that it wouldn't power up until the main return pump had been running a while after a power outage...
Add in a 4 pump dosing system for Triton Core 7... I guess I've got about as much automation as I need.