When my parents built a new house, they wanted to get smart home features and got quoted 12k CHF (pretty much same as USD) for a crappy proprietary system.

I asked them for 1/4th of that amount to buy hardware and do it myself. My philosophy when designing it, is that everything that is "smart" should have a non-smart backup. You can trigger the lights via an app or the tablet, but the switch on the wall also works. The garage can be opened remotely and automatically when the car approaches, but there's a physical radio remote that still does the job independently of the smart home system. You can set the blinds exactly at the level you want from the app, but the remote is always around if you need it. And so on.

The idea was that if the system goes down, everything should still work. But it also made me realise that the convenience of having both options is what my parents love the most. They mostly interact with things using the non-smart controls, but love to know that they can monitor and interact with these same things from anywhere.