For schlubs like us, not really that useful.

I only use it for turning on my ac/heating remotely using sensibo and for lights really. But I can use 2 apps for that

But, if you have multi story house or a large house, at a minimum, you really need a quick way to turn everything off with one press when leaving as an example and to ensure everything is locked. We also do things like allow all TV’s to see the CCTV, get alerts for pool, etc

Some home automation stuff though is pointless or a bad idea. And there are rich people who definitely do it to show off their house.

Commercial jobs also often need it, because people can’t be expected to know how to work the remotes, and lights need occupancy, etc. Also, there are considerations for emergencies and such

HA is basically a step above Google and Alexa, but some jobs need the stronger stuff