That's always a good idea, but how many people have the resources to research these details? First of all you have to be aware that this issue even exists. Then you have to scrape the corners of the internet for whether an appliance has any anti-features, because no manufacturer will ever write "collects unsolicited data about you, we will break the appliance if you refuse us your personal information" on the box. And finally you need to be able to afford the time and patience for the whole process.

I don't own a smart vacuum cleaner because the trouble is not worth it to me. However, I can see smart vacuum cleaners being very good for elderly or disabled people, or someone who has very limited free time and could let the robot clean the house on its own while the owner is out. It is really disgusting that scumbag manufacturers are exploiting those people.

The simplest way is to just not buy any IoT devices.