The encoder pushbutton is like an Enter button, just turn it for a new temp and press.
I think nobody needs 1°C resolution for temperature setpoint, that's 0.2%. Neither does my alarm clock need 1 minute resolution for wake time.
It could easily be 5°C, or like my coffee grinder turning the encoder up jumps more (1 second) and turning it down it decrements less (0.1 second).
In a manufacturing environment, there's a need to lock an soldering iron's temperature. I'm not sure why- most people get flamed if they crank it up too high and ruin tips.
So this need complicates the UI - need a password function etc.
Looking at the 888DX, it's still got a busy UI: Low temp alarm, presets, password lock, tip temp correction. Cluttered with features.
Yet I don't see auto-shutoff feature which Weller has, based on heat demand- not some shake switch in the handle. It's not hard to implement in F/W.