A lot depends on how you use it and how accessible it is to the outside internet.

I have a few smart devices, but they are all controlled locally. If my internet connection stops working, I still have full control of everything. I also have manual options in case my home network stops working.

Not advice, do your own research: I don't see a big problem it Bluetooth. It can be hacked, but the person hacking has to be near you. That alone protects you from about 8 billion people.