

If I’m gonna install a device by some random manufacturer that acts as a wifi access point inside my network, I also give them full access to my network. That access point can do all sorts of things, and I would describe this as a security nightmare. It also doesn’t even have to be malicious: the manufacturer could get hacked, and now the hacker has access to all these wifi access points all over the world, and all their home networks. Fun.
In the context of communication networks, WiFi is a high speed netowrk. It was designed to be basically a “normal” (ethernet-like) network, but wireless. It acts for all intents and purposes like an ethernet network. There are significant requirements that devices need to follow, many include frequently saying “hello” (simplified). The complexity of the protocol to be able to send at gigabit and faster speeds over dozens of meters is significant. Having relatively low latency adds to this as well. If all you need is a few bytes every now and then, that isn’t ideal. Having devices in your network that follow older/slower standards is essentially like pulling the handbrake for your network (again, very simplified). But explaining this in detail is also very much beyond the scope of a comment here.