You might look at Staples connect. From the beginning they made their top priority reliability, because their target market is small businesses. They got that reliability by offering very limited features and a very limited set if compatible devices, You can’t use IFTTT. There’s no Geofencing, there’s no custom code.
And many of the devices that they did pick are among the more expensive in their group.
But if you want lights that run on schedule even if the Internet is out, I think they deliver that today.
If you read their forums, you’ll see that most of the complaints are about devices that they don’t support. Not about events that ran fine on Monday and stopped running on Wednesday.
There’s no one perfect system out there. They each have pros and cons. Staples connect doesn’t give me the voice control that I need, or Geofencing. So it’s not a good match for me. But for somebody who just wants automated schedules, it does have reliability with or without the Internet.