I too am in the minority camp in favor of using WiFi on my smoker. I am now on my second smoker with a WiFi controller. The first one was a FireCraft unit. When the original FireCraft controller failed (this became a theme in the FireCraft channel), I replaced it with a WiFi controller from RecTec. My current smoker is a Yoder with the WiFi controller.
I found both WiFi controllers to be reliable. Both were easy to setup and connect to my smartphone. My smartphone is an older iPhone, so I don't know if people having trouble are on Android phones.
I like the WiFi controllers because of the reliability. I had used several remote thermometers (Maverick, iGrill, and another one I'm blanking on the manufacturer). These other ones had trouble transmitting from my back yard to the kitchen counter. I think the total distance was only 20 - 25 feet, but it had to go through the exterior wall of the house. I don't have this problem with WiFi. I use the app on the phone to monitor temperature, and I feel more mobile while cooking now, so I have done things like leave the house for an hour or two during cooks and felt ok being away because I could check temperatures, or set alarms for conditions.