I had a couple reasons; I wanted to have some real world experience with the system so that I could determine the strengths and weaknesses. If it is buggy, I don't want to recommend it to anyone.
I wanted to correct mistakes the original electrician made, where obvious three ways we're wired as single poles. Cutting down on the traffic on the carpet alone probably paid for the system.
I enjoy being able to set just about anything in the house to an astronomic timer, including the heating systems. Every weekday stumble lighting comes on at 4:45am, and I hit a button on my visor on the way out of the driveway and I know all the lights are off.
Every day the heaters in the bedrooms shut off a couple hours after sunrise and turn back on around sundown, saving energy. If we get a really cold snap where that doesn't work, a swipe and a poke on my phone manually overrides the automation for the day.
Schedules for multiple items are easy to change, I don't have to walk from point to point and do anything, a minute on the app is all it takes.
In 20 years if it is obsolete and causing problems, the house has conventional wiring, just put it back.