There is a difference between accurately controlling to within ±0.1 °C and a need to select with a resolution of ±0.1 °C. Maintaining temperature precisely is useful. It's what sous vide is mostly about. But I'm hard pressed to see the need for selecting that precisely. Even 0.5 °C increments already seem better than what is necessary.
Which recipes are there where I could reliably tell the difference between two identical dishes having been cooked at x °C versus x+1 °C? Eggs maybe? For almost anything else, I'd expect any difference to be close to undetectable.
If the 0.1 °C increments are important to you, use the app to set the temperature. The problem with the wheel is that, with 0.1 °C increments, you'd have to turn the wheel five times as far to change temperature, which would make it awkward to use. As is, the wheel works really well. I can use it to quickly and reliably dial up whatever temperature I want, without having to turn it excessively.