I just replaced my 1976 furnace. The new one has a smartphone ap that lets me control the settings. Big deal, If I am home I can walk up to it and if I am not home the default setting is fine.
Getting off topic, but app-controlled thermostats have been a convenience for me. No I don't need it when I'm home, but there have been times where my return home is delayed and I don't want to waste energy cooling/heating a house which I will not be occupying. Conversely, if I do leave work early, I can override the settings so I return to a home that is warm or cool to my liking.
For someone like me who has a somewhat erratic work schedule, and lives alone, it's extremely helpful. But even if I have a schedule that does not vary at all, I found it far easier to program the settings via an app vs on the thermostat itself. And I have more flexibility in that programming as well.