You could always run two wifi network SSIDs (depending on your gear I guess). Then you have the ability to have open wifi for guests, but also keep your other devices on a segregated network as an extra layer in your personal security profile.
I definitely could, and technically it would be easy. This is probably the way most people would solve this. But I don't because I don't like giving in to opinionated technology. But I may end up doing so if I eventually encounter a home appliance where I really do want to connect to it.