Just my personal opinion, but the thermometer on an A/C unit is kind of worthless unless you sit within a foot of the unit. I prefer being able to read a sensor on the opposite side of the room, or even several sensors throughout the house, rather than one on the A/C unit. I don't use any OEM app at all, just my own. The OEM ones never do exactly what I want, so I have to hack something additional onto their features anyways. Home automation systems are really personal anyways though. I'm sure anyone here who's implemented their own has their own unique opinions about what's best ;)

Now premium A/C unit in Japan like from Mitsubishi Electric features high precision temp sensor to detect room temperature. Even middle model has good sensor rather than simple temp sensor.

https://www.mitsubishielectric.co.jp/home/kirigamine/product... https://www.mitsubishielectric.co.jp/home/kirigamine/product...

Of course, and not only that, but very strongly held opinions too :)