Another rule of thumb - i know it's not always the best since some products are really nice aesthetically - is to buy only local smart stuff, for example, zigbee/zwave.
I live by this rule*. Being able to pick up stuff from IKEA that's well supported, well designed and really affordable is a huge advantage.
*almost, I have two things that need an app. My Vaillant boiler and my Yale alarm system. Both apps are terrible, but I have a 10 year warranty on the boiler and my alarm is up to scratch from a home insurance point of view.**
I live by this rule*. Being able to pick up stuff from IKEA that's well supported, well designed and really affordable is a huge advantage.
*almost, I have two things that need an app. My Vaillant boiler and my Yale alarm system. Both apps are terrible, but I have a 10 year warranty on the boiler and my alarm is up to scratch from a home insurance point of view.**