I think that the smart home is failing/will fail because people have a limit on how much they are willing to be tracked. Smart devices from TVs, to cameras to speakers to vacuums are reporting details of our lives that most people just don't want to give up.
It used to be the case that people feared that the government could watch them through their TV or listen in via their phone. Now, those things seem like they are product features.
Anecdotally: I don't have any smart home stuff, but literally every other member of my family does (parents, siblings, inlaws, etc). I've had numerous conversations in which they ask me why we accept an Echo or a Nest or something as a Christmas present, but my privacy concerns are always greeted with a blank stare. They just don't see it as an issue.
To them, the (perceived?) issue is how hard everything seems to setup and maintain. I haven't tried connecting any smart stuff lately, so maybe it's really easy for all I know, but all that stuff seems really advanced to them and they seem kind of afraid of it.
I doubt it. Most people literally don't care if Amazon is recording all their conversations. Even more people don't care as long as nobody at Amazon is actually listening.
Smart homes aren't super popular because of integration issues imo.
It used to be the case that people feared that the government could watch them through their TV or listen in via their phone. Now, those things seem like they are product features.