"Smart" is just about synonymous with "connected" these days, and any product with the originating company in its feedback loop represents a risk that the product will start working against the user in some way either immediately or after some honeymoon period.
A smart TV means it can run apps basically. There is really nothing smart about that... It would be smart if it would mute itself during commercials, for example. All these 'Smart' things should work for me instead of for the vendor really.
Concerning the connected stuff: I ordered a new robot vacuum the other day and checked if it could integrate with Home Assistant and fell into the 'local push/poll' category of integrations [0].
[0] https://www.home-assistant.io/blog/2016/02/12/classifying-th...